Noticed the weirdest thing just now, though I think this is an older bug that has been fixed before.

We played a p0 map that featured a row of couches placed on top of a trampoline ground. Out of the 25 mice, 3 or 4 completely random players didn't collide with the couches, instead bouncing off the trampoline to victory. I'm very confident that they did not hack (you simply don't spot 4 hackers at once on EN).

So yes that.

Maybe they have minimalist mode on? There was a thread like this which said the mice went through all decorations, because minimalist mode hides it. I think it's because of that.