I have a system built on ArcGIS Experience. When switched to mobile view, not all map buttons are correctly displayed. All buttons are OK except "Clear selected" and "Zoom to selected".
We are seeing similar behavior with mobile Experience builder apps as well, only with more bugs. I would suggest opening an ESRI tech support ticket like we did.
Jansen Lyons - Records and GIS Section - Public Works - City of Rio Rancho, NM