ZONE DOCTOR - FF6 Editor v3.18.4 (formerly FF6LE) *EVENT EDITING SUPPORT*

Thanks for posting the log. Looking through it, it seems you imported some elements from another ROM. Then I was able to discover a bug in the import elements window which corrupts the tilemaps with location map data if you have "Locations > Maps" checked. I've now fixed the bug, but did you have this node checked by any chance?

Also, users may notice that graphics aren't saving at all. I've now fixed this as well.