I walked into the Deadwood furniture shop and got the same message Rufus got...then I got I got warped again after taking two steps and got the same message. Then again, then I flipped a table x_x just stick to warp lines in off map areas. Just make it so it warps you out of the level if you're on that level unless you're on an RC Tag. Rather than having it be based on lag levels.
(Note: I'm not sure if that's what you're trying to do or not so I could just be saying what you're currently doing thus would make me feel foolish if I was)