The 'if' condition not work properly in BaseAdapter

I have this code in my getView of BaseAdapter class:

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    View v;
    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = inflater.inflate(R.layout.listview_item, parent, false);
    } else {
        v = convertView;
    }
    LinearLayout mLayout = v.findViewById(R.id.layout_list_item);

    if (!mList.get(position).isOperative()) {
        mLayout.setBackgroundResource(R.drawable.list_item_background_inactive);
    } else {
        mLayout.setBackgroundResource(R.drawable.list_item_background_active);
    }

    TextView mTextOne = v.findViewById(R.id.text_one);
    TextView mTextTwo = v.findViewById(R.id.text_two);

    mTextOne.setText(mList.get(position).getPropertyOne());
    mTextTwo.setText(mList.get(position).getPropertyTwo());

    return v;
}

The background was applied properly at the begin, but if I scroll, I'm losing the initial setting.

Any ideas?

Thanks in advance!