The following image should self-explain everything


Basically keyboard height goes opposite of what screen rotation supposed to be, it usually happened after the screen is being rotated from/to portrait/landscape (idk how to explain it lol)
I'll add the landscape-screen—portrait-keyboard thingy if i encountered it again
Also in case you wondering, keyboard height is set to 105% not 50% or 150%, and it didnt happen on other keyboards (eg. FUTO Keyboard, Florisboard, Heliboard, Gboard)