well the last thing that i could possibly think of is the collision
now, as a big mean collision thing, it will keep working until it's shutted one way or another
truely most of the time you'll just need to switch and precondition and then you can laugh at it
sadly that's not the case, seeing as you teleported it might not realize it's supposed to shut up, thus adding erase event after the switch may solve it
otherwise you gonna have to show me how you started this event cause the problem may be there
(also, seeing as your npc does not move, hero touch or action key trigger may just be enough to solve it without any changes in the event.)