Garbled Tilemaps (SOLVED)

[Kirb]

I'm having an issue where I have a large tilemap image (set as a spritesheet). I'm continually revising and overwriting the image with new tiles, but not actually changing the image size at all.

Normally I don't have many issues, but for some reason when I need to delete a bunch of unused tiles from the image and replace it with other, different tiles; when I overwrite the image in the project, the tilemaps using said spritesheet in the project become impossibly garbled for some reason.

Is there any reason why this would be happening?

EDIT:  Disregard, stupid mistake on my part. Just a few layers on that weren't supposed to be on.

[Fome]

I run into this issue when I have the tilemap editor up.

I usually just "commit" then "edit" again and my tilemap is ready to go.