I use exb in arсgis online to create my portals. Faced with the problem of displaying them on iOS devices. When I try to switch from object to object and open the popup, at some point the new cards stop opening.
1. I click on the icon of the object on map
2. I click on the signature to open the pop-up
3. I try to click on the icon of another answer, but the signature does not change.
Everything works fine on android devices. I thought that the problem could be in the use of Cyrillic, but using exclusively Latin letters did not give results.
Follow the link for an example of an error. On page one is my working map (with Cyrillic), on page two are random layers from the live atlas for the test. Both options don't work on iPhone 7.
The application in ExB consists of two pages with a single widget - a map. List of layers of map2 on screenshot.
Have you looked in the developer tools to see what is being requested and returned? You may find the issue or at least a clue to what might be happening. I had a similar issue with pop-ups on an iPad with a 3D experience builder application but never found a resolution.