Collisions while crouched in an enclosed space

I’ve noticed that if two players are nocollided (either by collision group or otherwise) and they’re in a rather enclosed space (such as a vent) and they move against each other, or one moves against the other, they appear to have some sort of magnetic effect against each other (they can’t go past each other, and one can actually push the other). Does anyone have a solution to this, or is it just source not agreeing with collisions while crouched?