My app contains a screen with a gallery, which can be sorted and filtered with some controls. These controls are grouped together as a popup, which appears when someone presses the sort/filter button (updatecontext a variable which controls the visible property). This group is the top group in the tree view/Z-order.
For most users the intended popup with the sort/filter menu appears when they press the button. But for some users the popup is transparent and the sort/filter controls are shown in the same layer as the gallery text (see attached screenshot).
Does anyone have an idea what could cause this problem and how I can solve it?
