Choose input device - Keyboard changing

I'm going mad and can't pinpoint the issue.

Honor View 20, Magic 3.0.0, Android version 10.

I was ADB authorising Tasker, Join and Autovoice for Android 10 and since then my Android system switches the Keyboard input methods between my keyboard, Tasker and Join, making typing virtually impossible as the keyboard minimises every few seconds.

I have tried the basics of uninstalling, reinstalling, re-authorising, trying different keyboards installs but nothing holds. I can't find any other similar issues online so it must be something very specific I have done but not sure where to start. Any suggestions would be appreciated.