My display seems to jump around randomly on the base screen, and battle screens have the heroes inverted and zooming in and out about once per second, so that the bottom row is occasionally visible but functionally inaccessible, while the next row is sometimes covered but can still be used. This is a bit disconcerting.
Edit: still happening, getting more frequent. The only fix seems to be rebooting my phone. HTC One M7 running Android 5.0.2.
Update 29th April 2018. It’s still not resolved. Might be OK for a day or two but then happen two or three times in one day. I don’t like having to restart my phone all the time over one game. If it gets any worse I’ll be leaving.