I don't know why it does, and I am aware the DM' know of the issue with people coming through a transition and glitching riiiiiiight to the other end of the area. Sometimes its fine. But two places for instance people end up stuck on a ledge or behind the vallaki wall with no way out, or at the bak of the citadel which is also no way out.
And DM's being only human (Don't slay me..) can't be on all the time nore help instantly, or for a while if they are running an event for a group.
Would it be possible. to put in one way transitions up in these places as a 'escape' route from being suck via glitch. Just an idea.