[Torankusu]

post some script(s) please.
don't really feel like logging onto a private server after aforementioned security flaws, and not really looking forward to hunting down some hotel system...

Just based on the description, you need to compensate for the direction the player is traveling in, because it seems you are probably warping him either:
1.) Directly on top of the next NPC, causing the player to touch the NPC event to occur, and warp him appropriately, or
2.) You are warping him too few tiles apart from the NPC and he is still traveling causing him to touch the NPC promptly after he warps.

A video here might help.

Also, is there any particular reason you are using NPCs to set the level here?
If this is some form of an elevator system, don't you think you could integrate it into a grab system you develop? ( onActionGrab() )