Gemini, I know it is late and you most probably have the answer already. The easiest way to fix this issue is to just add menu.clear();
public void onPrepareOptionsMenu(Menu menu) {
MenuInflater inflater = new MenuInflater(getActivity().getApplicationContext());
menu.clear();
super.onPrepareOptionsMenu(menu);
inflater.inflate(R.menu.myMenu, menu);
}