Repeating parts of words whilst typing

Since updating to macOS Catalina, my MacBook Pro 2019 has been randomly repeating parts of words whilst I have been typing (ie. it just wrote 'whilst I have bhave ee' whilst typing that sentence).

This issue happens both with the inbuilt keyboard and a bluetooth keyboard. I'v've* tried slowing down the key repeat time, but I can't f can't ind* any mention of this issue online. Would appreciate any help, thank you!

(* = examples of this happening in real time!)