Are these issues specific to raspberry pi or do you see the same issues on a touch screen laptop?
Share a minimal, runnable example and I’ll take a look.
A few other thoughts:
Make sure if you are requesting the keyboard, that you are properly closing it see: https://kivy.org/doc/stable/api-kivy.core.window.html#kivy.core.window.Keyboard
Read the docs on focus: https://kivy.org/doc/stable/api-kivy.uix.behaviors.focus.html#module-kivy.uix.behaviors.focus
Specifically see:
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