Script Rewrite (Final Draft) Underway!

So, I’m at the very final stage of developing this script into a .ips file. I’m starting to edit events in FF6Tools and it’s coming along well. However I’ve noticed that, when I make changes to an event, curtain map tiles will become impassable…sometimes the sprite will get stuck on a maptile and won’t be able to leave that tile. Other times, it’s as if most tiles surrounding the event form an impassable wall. Could this be due to a corrupt save file??? I’m using an old save file when I play test. I’ve also been playing around with FF3LE, and I know you can preview events using that tool. But, I’m not sure how to do so yet…

Anyway, would these issues stem from the Rom, or the save file?