Ok, so when the bot moves you vertically in very small hops... when all is great, you get the upward hop... when the failure happens, you get an upward hop, followed by a downward hop (like a jump back), and that leads to the character not clearing the room and being stuck in the room.
But this only happens when you have multiple windows.
One more idea, is it possible to do the candles first and open one chest (to get the shells) before doing anything else? I think that's the priority in the instance right? So on a script restart, it took me a while to notice i was stuck, used up most time, the restart worked great, but it went off to get the tombstone thingies, ran out of time before it could have gotten to the central room.
I planned on trying to mess with it myself, but this may be a beneficial feature for many users. Besides, messing with stuff seems to get me in trouble often, currently I seem to target but not attack mobs in goblins, just noticed it today.
EDIT: And yes, I meant the barriers, sorry, I tend to give things my own names