This is a previously reported bug in Form view that you could not reproduce. But now I believe I’ve found the problem. While LatLong is spinning trying to find your location, any text entries will intermittently close the keyboard. Our reporters cannot wait until LatLong converges to make entries.
I hope that people who deal with such issues at AppSheet have seen this. It might be a good idea, though, to send them an e-mail about it: email@example.com
A fix for this is being rolled out now.