toolbar doesnt hide when i change fragment to expandable list view

hi, thanks for this good lib!
i've tried to change 1 tab to my custom list view (expandable list view type). the expandable list view is working, but when i scroll my expandable list view, it seems the FAB and the toolbar does not hide, meanwhile on tab 2 there is default recycle view and it hide the toolbar when it scrolled..

any suggestion for this? thanks
