I used Experience builder to create a map app that allows a user to switch between several maps. The user selects the map to display using a menu widget. If a user selects a map feature, a custom popup displays that was coded using Arcade. When I view the Experience on a Windows Desktop or Android OS, everything works great but if I view the Experience on an iPhone, the menu widget (and text widget) float above the popup.
Here is the Experience view before a feature is selected. The menu and text widget is in the bottom left.

This is what the popup looks like on a Windows Desktop and Android OS (and how I want it to always look):

And here it is when the popup displays on the iPhone:

Any idea what causes the popup not to be the top item in the view and how I can fix it?