ExpandableListView works bad when I use checkBox in child layout it remembers cheched itme and do the same to other child layout

I use ExpandableListView. There I have checkBox (in child_layout) and when i checked one of them and close this parent_layout and then open other parent_layout there is also checked the checkBox.

I opened Sports and then checked Football (child) and then closed

And when I opened the second one (Sciences) the checkBox was automatically checked

And how can I manage it ?