I never knew it was a controller drift because I had a nintendo switch and I played so many hours in Mario Kart 8 deluxe that the controller drift happen a lot to me and I always have to detach the joy cons to make sure it doesn't happen again.
My ps4 controller started doing that, sometimes. Now their is something rare that happens is the controller will thinking im holding R1 when im clearly not even holding it or pressing it so i can disconnect the controller just to get it to work again
I ended up having to just buy a new controller. And from now on, I’m trying to make sure I don’t try too hard in games in case it might affect the buttons, or get any dust on my controllers (so I put it away rather than just leaving it out)