ViewPager - problems with adding or updating cards

I recently started to program an app which uses ViewPager. I'm currently stuck with adding new data to the Adapter. My problem is, that if I add new data to the Array lists of my adapter, the view will be created but shows strange behaviour. I can scroll to it, but once I try to get away from my page, the app will crash in an overflow error. I debugged the App and noticed, that the InstanciateItem() method will not be called. Therefore the data will be added to my Arraylist but no view gets created. This behaviour does not change when I call InstanciateItem() manually, besides the fact that the view gets created this time.

During startup in the onCreate() method of my mainActivity I will execute the following code:

    mViewPager = (ViewPager) findViewById(R.id.viewPager);
    mCardAdapter = new CardPagerAdapter(this, mViewPager);
    mCardAdapter.addCardItem(new CardItem("test1", "ip : 123.123.1.1", "status active"));
    mViewPager.setAdapter(mCardAdapter);

This card will be added and they are fully functional during scroll operation. Later in MainActivity, I will execute the following code:

if(!name.isEmpty() && !IP.isEmpty() && !PW.isEmpty()){

                mCardAdapter.addCardItem(new CardItem(name,IP,"status active"));

                mCardAdapter.instantiateItem(mViewPager,mCardAdapter.mData.size()-1);
                
                System.out.println(mCardAdapter.mViews + " "+ mCardAdapter.mData);
                dialog.dismiss();
            }

This time it behaves as I described, it does not matter if I call instantiateItem() manually or not, the behaviour is the same.

I will post you the code of my Adapter, maybe you can help me out here.

public class CardPagerAdapter extends PagerAdapter implements CardAdapter {

    ViewPager viewPager;
    MainActivity mainActivity;

    public List<CardView> mViews;
    public List<CardItem> mData;
    private float mBaseElevation;

    public CardPagerAdapter(MainActivity mainActivity, ViewPager viewPager) {
        mData = new ArrayList<>();
        mViews = new ArrayList<>();
        this.mainActivity = mainActivity;
        this.viewPager = viewPager;
    }

    public void addCardItem(CardItem item) {
        mViews.add(null);
        mData.add(item);
        notifyDataSetChanged();
    }

    public void deleteCardItem(int position){
        mData.remove(position);
        mViews.set(position, null);
        notifyDataSetChanged();
    }

    public float getBaseElevation() {
        return mBaseElevation;
    }

    @Override
    public CardView getCardViewAt(int position) {
        return mViews.get(position);
    }

    @Override
    public int getCount() { return mData.size();}

    @Override
    public int getNumberOfCards() {return mViews.size();}

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
        mViews.remove(position);
    }

    @Override
    public int getItemPosition(@NonNull Object object) {
        int position = mViews.indexOf(object);
        if(position == -1){
            return POSITION_NONE;
        }else{
            return position;
        }
    }


    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        Button deleteButton;
        Button editButton;

        View view = LayoutInflater.from(container.getContext()).inflate(R.layout.device_card_layout,      
        container, false);

        deleteButton = view.findViewById(R.id.deleteButton);
        editButton = view.findViewById(R.id.editButton);

        deleteButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                System.out.println("fetus deletus");
                deleteCardOperation(viewPager.getCurrentItem(), container);

            }
        });

        editButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                System.out.println("edit");
                int currentCard = viewPager.getCurrentItem();
            }
        });

        container.addView(view);
        bind(mData.get(position), view);

        CardView cardView = (CardView) view.findViewById(R.id.itemCard);

        if (mBaseElevation == 0) {
            mBaseElevation = cardView.getCardElevation();
        }

        cardView.setMaxCardElevation(mBaseElevation * MAX_ELEVATION_FACTOR);
        mViews.set(position, cardView);

        return view;
    }

    private void bind(CardItem item, View view) {
        TextView titleTextView = (TextView) view.findViewById(R.id.itemText);
        TextView ipTextView = (TextView) view.findViewById(R.id.itemIPAdress);
        TextView statusView = (TextView) view.findViewById(R.id.itemActiveStatus);
        titleTextView.setText(item.getName());
        ipTextView.setText(item.getIp());
        statusView.setText(item.getStatus());
    }

    private void deleteCardOperation(int position, ViewGroup desV){

        CardItem x = mData.get(position);

        AlertDialog.Builder builder = new AlertDialog.Builder(mainActivity, 
        android.R.style.Theme_Material_Dialog_Alert);
        builder.setTitle("Confirm");
        builder.setMessage("Are you sure you want to delete this device: "+ x.getName() + " ?");
        builder.setPositiveButton("YES", new DialogInterface.OnClickListener() {
        
        public void onClick(DialogInterface dialog, int which) {
            deleteCardItem(position);
            dialog.dismiss();
        }
    });

    builder.setNegativeButton("NO", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            // Do nothing
            dialog.dismiss();
        }
    });

    AlertDialog alert = builder.create();
    alert.show();



}


}

My problem is, that i do not understand, why the code behaves so differently. I just searched though many of the suggestions made here on StackOverflow but can not find a conclusion for me. Maybe im just missing something. I would be glad for any suggestion or help with my problem.