Android GridView Sıra sorunu

Ödevim için bir Android projesi üzerinde çalışıyorum fakat aşağıdaki hatayla karşılaşıyorum. Yardımcı olursanız sevinirim. 

http://hizliresim.com/ojVDXQ

http://hizliresim.com/ojVDXQ

Custom Adapter XML kodlarım 

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="90dp"
    android:layout_height="90dp">
    <ImageView
        android:id="@+id/Masa_Resim"
        android:layout_height="90dp"
        android:layout_width="90dp"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"></ImageView>
    <TextView
        android:id="@+id/Masa_No"
        android:layout_height="15dp"
        android:layout_width="60dp"
        android:textAlignment="center"
        android:textColor="@android:color/white"
        android:layout_marginTop="70dp"
        android:layout_centerHorizontal="true"></TextView>
</RelativeLayout>

Custom Adapter Classım

 int masaSayisi;
    Context c;
    masa[] masas;
    public Masa_Adapter(Context c, int MasaSayisi,masa[] masas){
        this.c=c;
        this.masas=masas;
        masaSayisi =MasaSayisi;
    }
    @Override
    public int getCount() {
        return masaSayisi;
    }
    @Override
    public Object getItem(int position) {
        return null;
    }
    @Override
    public long getItemId(int position) {
        return 0;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view;
        if(convertView==null){
            view = new View(c);
            view = inflater.inflate(R.layout.masalar,null);
            TextView text = (TextView) view.findViewById(R.id.Masa_No);
            text.setText("Masa "+(position+1));
            ImageView image = (ImageView)view.findViewById(R.id.Masa_Resim);
            if(!masas[position].durum)
                image.setImageResource(R.drawable.masabos);
            else image.setImageResource(R.drawable.masadolu);
        }
        else view=(View)convertView;
        return view;
    }
}

Ekran XML kodlarım

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <GridView
        android:numColumns="auto_fit"
        android:gravity="center"
        android:columnWidth="100dp"
        android:stretchMode="columnWidth"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/MAsalar"
        />
</LinearLayout>