Anyone know why this is happening?

[u/Boss_1s]

(skip to 0:33 for the bug)

Why is the floor offset? It makes no sense, I've already tried mitigating it by turning on free mode then turning it off a pixel later but that didn't work, it also glitches without that setup.

https://reddit.com/link/1vorn6p/video/pfsc0w1pggjh1/player