I've seen it happen multiple times, I have no idea whats causing it but it primarily happens in the veil area. Its possibly an issue related to when players or anything that has a collision box crosses the veil, whatever interaction that veil has with the player/object gets that objects collision box to remain there when crossing the veil. No idea what else could be causing a collision interaction besides that. I've seen it occur on that exact veil at least 3 times, I can't remember if its happened on other ones.