This happens to iOS: every time there's a new major version coming, the layout of many apps breaks for some reason and elements move all over the place. I wonder why.
I had some apps break and need update after an iOS update, but not layout problems in apps... at least not in the 50+ non-Apple apps I use...
More annoyingly, it seems the changes to how multiple windows are handled has made it so any visible notification will prevent me from interacting with anything except the notification, so I can't ignore them anymore - I have to dismiss them to carry on using the phone.