CardView içerisindeki RadioButton otomatik olarak seçiliyor

Geliştirmekte olduğum test çözme özelliğinde şöyle garip bir  hata ile karşı karşıyayım. WebService'den Json formatında verileri çekiyorum ve çektiğim array i recyclerview ile listeliyorum. Soru ve 4 adet şıktan oluşan her item'ı cardviewler içerisinde gösteriyorum. Şıkları radiobutton olarak göstermeyi tercih ettim. 20 tane soruyu cardviewler içerisinde listeledim ve birinci sorunun A şıkkını seçtiğim zaman aynı anda 7. 13. ve 19.sorularında A şıkkı kendiliğinden seçiliyor. 6 soruda bir tekrar eden bu hatayı kodlarda 6 ile ilgili bir şeyler arayarak bulmaya çalıştım fakat 6 ile alakalı hiç bir kodum yok. Test sorularının listelendiği activity ve CardAdapter ı şöyle : 

TestActivity.class

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.Volley;
import com.github.pwittchen.reactivenetwork.library.rx2.ReactiveNetwork;
import com.ogrenciasistani.lgsasistan.R;
import com.ogrenciasistani.lgsasistan.adapters.CardAdapter;
import com.ogrenciasistani.lgsasistan.configs.Config;
import com.ogrenciasistani.lgsasistan.models.SuperHero;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

import io.reactivex.Single;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.functions.Consumer;
import io.reactivex.schedulers.Schedulers;

public class TestActivity extends AppCompatActivity {

    //Creating a List of superheroes
    private List<SuperHero> listSuperHeroes;

    //Creating Views
    private RecyclerView recyclerView;
    private RecyclerView.LayoutManager layoutManager;
    private RecyclerView.Adapter adapter;

    //Volley Request Queue
    private RequestQueue requestQueue;

    //The request counter to send ?page=1, ?page=2  requests
    private int requestCount;
    private String CONFIG_URL;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test_fragment);

        String testNo = getIntent().getExtras().getString("testno").toString();
        setTitle(testNo);

        String whichSubject = getIntent().getExtras().getString("whichSubject").toString();
        if (whichSubject.equals("Turkce")) {
            CONFIG_URL = Config.DATA_URL;
        } else if (whichSubject.equals("Math")) {
            CONFIG_URL = Config.DATA_URL_MATH;
        } else if (whichSubject.equals("Science")) {
            CONFIG_URL = Config.DATA_URL_SCIENCE;
        } else if (whichSubject.equals("History")) {
            CONFIG_URL = Config.DATA_URL_HISTORY;
        } else if (whichSubject.equals("English")) {
            CONFIG_URL = Config.DATA_URL_ENGLISH;
        } else {
            Toast.makeText(this, "whichSubject is null", Toast.LENGTH_SHORT).show();
        }


        requestCount = getIntent().getExtras().getInt("testnoint");

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);

        //Initializing Views
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);

        //Initializing our superheroes list
        listSuperHeroes = new ArrayList<>();
        requestQueue = Volley.newRequestQueue(getApplicationContext());

        //Calling method to get data to fetch data
        getData();

        /*
        //Adding an scroll change listener to recyclerview
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            recyclerView.setOnScrollChangeListener(this);
        }
        */

        //initializing our adapter
        adapter = new CardAdapter(listSuperHeroes, getApplicationContext());

        //Adding adapter to recyclerview
        recyclerView.setAdapter(adapter);

    }


    //Request to get json from server we are passing an integer here
    //This integer will used to specify the page number for the request ?page = requestcount
    //This method would return a JsonArrayRequest that will be added to the request queue
    private JsonArrayRequest getDataFromServer(int requestCount) {
        //Initializing ProgressBar
        final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1);

        //Displaying Progressbar
        progressBar.setVisibility(View.VISIBLE);
        setProgressBarIndeterminateVisibility(true);

        //JsonArrayRequest of volley
        JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(CONFIG_URL + String.valueOf(requestCount),
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        //Calling method parseData to parse the json response
                        parseData(response);
                        //Hiding the progressbar
                        progressBar.setVisibility(View.GONE);
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        progressBar.setVisibility(View.GONE);
                        //If an error occurs that means end of the list has reached
                        Toast.makeText(getApplicationContext(), "Daha fazla soru yok.", Toast.LENGTH_SHORT).show();
                    }
                });

        //Returning the request
        return jsonArrayRequest;
    }

    //This method will get data from the web api
    private void getData() {
        //Adding the method to the queue by calling the method getDataFromServer
        requestQueue.add(getDataFromServer(requestCount));
        //Incrementing the request counter
        //requestCount++;  // kaldırmayı dene ne olacak gör ?
    }

    //This method will parse json data
    private void parseData(JSONArray array) {
        for (int i = 0; i < array.length(); i++) {
            //Creating the superhero object
            SuperHero superHero = new SuperHero();
            JSONObject json = null;
            try {
                //Getting json
                json = array.getJSONObject(i);

                //Adding data to the superhero object
                superHero.setSorutitle(json.getString(Config.TAG_SORU_TITLE));
                superHero.setSoruoption1(json.getString(Config.TAG_SORU_OPTION_1));
                superHero.setSoruoption2(json.getString(Config.TAG_SORU_OPTION_2));
                superHero.setSoruoption3(json.getString(Config.TAG_SORU_OPTION_3));
                superHero.setSoruoption4(json.getString(Config.TAG_SORU_OPTION_4));
                superHero.setSorucevap(json.getString(Config.TAG_SORU_CEVAP));
            } catch (JSONException e) {
                e.printStackTrace();
            }
            //Adding the superhero object to the list
            listSuperHeroes.add(superHero);
        }

        //Notifying the adapter that data has been added or changed
        adapter.notifyDataSetChanged();
    }

    //This method would check that the recyclerview scroll has reached the bottom or not
    private boolean isLastItemDisplaying(RecyclerView recyclerView) {
        if (recyclerView.getAdapter().getItemCount() != 0) {
            int lastVisibleItemPosition = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastCompletelyVisibleItemPosition();
            if (lastVisibleItemPosition != RecyclerView.NO_POSITION && lastVisibleItemPosition == recyclerView.getAdapter().getItemCount() - 1)
                return true;
        }
        return false;
    }


    /*
    //Overriden method to detect scrolling
    @Override
    public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
        //Ifscrolled at last then
        if (isLastItemDisplaying(recyclerView)) {
            //Calling the method getdata again
            getData();
        }
    }
    */

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_test, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        if (item.getItemId() == android.R.id.home) {
            finish(); // close this activity and return to preview activity (if there is any)
        } else if (id == R.id.end){

        } else if (id == R.id.answerkey){

        }

        return super.onOptionsItemSelected(item);
    }

}

CardAdapter.class

import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
import com.ogrenciasistani.lgsasistan.R;
import com.ogrenciasistani.lgsasistan.helper.CustomVolleyRequest;
import com.ogrenciasistani.lgsasistan.models.SuperHero;

import java.util.List;


/**
 * Created by cumakesici on 01/06/2017.
 */

public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
    SuperHero superHero;
    private Context context;

    //List to store all superheroes
    List<SuperHero> superHeroes;

    //Constructor of this class
    public CardAdapter(List<SuperHero> superHeroes, Context context) {
        super();
        //Getting all superheroes
        this.superHeroes = superHeroes;
        this.context = context;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.superheroes_list, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, final int position) {

        //Getting the particular item from the list
        superHero = superHeroes.get(position);


        /*
        //Loading image from url
        imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
        imageLoader.get(superHero.getImage(), ImageLoader.getImageListener(holder.imageView, android.R.drawable.ic_dialog_alert, android.R.drawable.ic_dialog_alert));
        */
        //Showing data on the views
        //holder.imageView.setImageUrl(superHero.getImage(), imageLoader);

        holder.soruTitle.setText(superHero.getSorutitle());
        holder.soruOption1.setText(superHero.getSoruoption1());
        holder.soruOption2.setText(superHero.getSoruoption2());
        holder.soruOption3.setText(superHero.getSoruoption3());
        holder.soruOption4.setText(superHero.getSoruoption4());
        String soruCevap = superHero.getSorucevap().toString();


        holder.soruOption1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                Toast.makeText(context, position+1 +".sorunun A şıkkına tıklandı.", Toast.LENGTH_SHORT).show();
            }

        });


        holder.soruOption2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                Toast.makeText(context, position+1 +".sorunun B şıkkına tıklandı.", Toast.LENGTH_SHORT).show();

            }
        });

        holder.soruOption3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                Toast.makeText(context, position+1 +".sorunun C şıkkına tıklandı.", Toast.LENGTH_SHORT).show();

            }
        });

        holder.soruOption4.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                Toast.makeText(context, position+1 +".sorunun D şıkkına tıklandı.", Toast.LENGTH_SHORT).show();

            }
        });

    }

    @Override
    public int getItemCount() {
        return superHeroes.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        public TextView soruTitle;
        public RadioButton soruOption1;
        public RadioButton soruOption2;
        public RadioButton soruOption3;
        public RadioButton soruOption4;
        public TextView soruCevap;

        //Initializing Views
        public ViewHolder(final View itemView) {
            super(itemView);


            soruTitle = (TextView) itemView.findViewById(R.id.soruTitle);
            soruOption1 = (RadioButton) itemView.findViewById(R.id.soruOption1);
            soruOption2 = (RadioButton) itemView.findViewById(R.id.soruOption2);
            soruOption3 = (RadioButton) itemView.findViewById(R.id.soruOption3);
            soruOption4 = (RadioButton) itemView.findViewById(R.id.soruOption4);

        }


        /*
        @Override
        public void onClick(View view) {
            Toast.makeText(view.getContext(), "position = " + getPosition(), Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(context,DetailActivity.class);
            intent.putExtra("title",superHero.getTitle());
            intent.putExtra("detail",superHero.getDetail());
            intent.putExtra("image",superHero.getImage());
            intent.putExtra("author_name",superHero.getAuthor_name());
            intent.putExtra("author_avatar",superHero.getAuthor_avatar());
            intent.putExtra("date",superHero.getDate());
            intent.putExtra("share_link", superHero.getShareLink());

            context.startActivity(intent);
        }

        */
    }


}

SuperHero.class

public class SuperHero {

    private String sorutitle;
    private String soruoption1;
    private String soruoption2;
    private String soruoption3;
    private String soruoption4;
    private String sorucevap;

    public String getSorutitle() {
        return sorutitle;
    }

    public void setSorutitle(String sorutitle) {
        this.sorutitle = sorutitle;
    }

    public String getSoruoption1() {
        return soruoption1;
    }

    public void setSoruoption1(String soruoption1) {
        this.soruoption1 = soruoption1;
    }

    public String getSoruoption2() {
        return soruoption2;
    }

    public void setSoruoption2(String soruoption2) {
        this.soruoption2 = soruoption2;
    }

    public String getSoruoption3() {
        return soruoption3;
    }

    public void setSoruoption3(String soruoption3) {
        this.soruoption3 = soruoption3;
    }

    public String getSoruoption4() {
        return soruoption4;
    }

    public void setSoruoption4(String soruoption4) {
        this.soruoption4 = soruoption4;
    }

    public String getSorucevap() {
        return sorucevap;
    }

    public void setSorucevap(String sorucevap) {
        this.sorucevap = sorucevap;
    }
}