recyclerview - Drag and drop and notifyItemRemoved with Android doesn't work correctly -

i'm following tutorial remove item recyclerview:

https://medium.com/@ipaulpro/drag-and-swipe-with-recyclerview-b9456d2b1aaf

to remove item, used following piece of code:

 @override   public void onitemdismiss(int position) {    mpedidos.remove(position);    madapter.notifyitemremoved(position);    madapter.notifyitemrangechanged(position, getitemcount());  }

in way, when element eliminated, lower element rises occupy new post, remains 'phantom' of itself.

that is, example, suppose have following:

item 1

item 2

item 3

if delete item 2, list follows:

item 1

item 3

item 3

any ideas or suggestions problem might be?

thanks