Ionic bug when scroll data list

Hello guys,
I am facing a ionic bug on data list.
I have a parent list and loading and scroll ok. Then I click item a1 to show all child items in a1(Now, when a1 is expanded, the length of list change). When I scroll that list, it will be stopped at the same length with old list (when list has not expanded), then I scroll again, it will be show all list.
I think it is a ionic framework. (Ionic 1)
Do anyone fix it?