Figured out what caused that, it was the newer version of RPG Maker 2003 on Steam conflicting with a file that had been unofficially patched in an old version years ago that SHOULD be the one that is used. This is the RPG_RT.exe file in the game’s directory. I uploaded it to Itch, all you have to do is download RPG_RT.exe and replace the one the game’s folder with the newly downloaded version.