Ok look, I normally play Blockland with a track pad. recently, before v20, I have been having some problems turning without it jerking somewhere. I tried plugging in my mouse, it still does it. I got on steam and played some steam games, it doesn't jerk at all. It's not inverted, nor is it my mouse.
Sorry I didn't explain much, I thought someone would know what was going on right away.
I'll record it later, I'm on a different computer at the moment.