problem with multiple view types in recycler view

Question

I am trying to use recycler view with multiple view types in the getitemtype() method I used the below code when I use this code at 5th position one of my item is not visible its looking add when I add new values to that list....by the way here I'm using firebase fire store to store and retrieve data and in between this list I tried to place ad-mob native ads .

  override fun getItemViewType(position: Int): Int {
     if (position%5 == 0){
//        after 5  items show add
        return VIEW_TYPE_AD

    } else{
//      to show content 
        return VIEW_TYPE_CONTENT
    }
}

i need to know how to show the 5th item of main list along with native ad...mean i want know to how to show both view types without overlapping.