Strange wrong warping when going offscreen

[mingus.]

I'm not sure if this is a bug on the NESMaker program's end or an error I made on my end, but in my game (using a top-down adventure module), when I walk to the right side of a specific screen to go to the one adjacent to it, I instead get sent to a completely different screen than intended, that happens to be right next to the GameOver screen.

This is the best I can display it:

(Full game map)
It's a little hard to see, so open the image in a new tab to see it better.

This only seems to happen on this screen, and it isn't all the time, but it is consistent enough to where it's messing with the game. I walk to the right edge of the screen (the one with the smaller arrow), and I go to the screen x=1, y=0. It is always this screen, never anything different.

Has anybody else run into this? Or have any idea (or better yet know how to) fix it? I really don't want to have to restart this game from the beginning.

 

[dale_coop]

Do you use the stock module or a custom BBI module?
Do you placed any warp tiles on the right of that screen (or on the left of the next one)? this would explain why your player warps elsewhere...

 

[mingus.]

I use the stock module, and the tiles on the side are all labelled as Null.
After some further checking though, I noticed that it happens more often after talking to an NPC on the screen. Would the trigger somehow mess with the code that switches screens?