Remove Item of List view not appear

@CraigDunn
Hi
I have listview with context action for delete

Global.PList=parser.removeItem(Global.PList,"rasoll@xyz.com");
                        listView.ItemsSource = Global.PList;

but ,if i push to another page and pop its appear .

if i delete a item and go to page add item , add a item and pop listview not change.

i test it sevral times if i remove 2 item and add 2 item, never change appear list view because listview item source count is equal before

i test it sevral times if i removed item > add item ,never change appear list view because listview item source count is Less than before

i test it sevral times if i removed item < add item , change appear list view because listview item source count is more than before

Is it bug ?or I am wrong ?