There is no actual attack change in the dungeon, it only happens with weapons. It might just be the public build. I haven't had the problem in the patreon build. A new public build is coming in November, at least then it'll be fixed.
hopefully i don't mind starting over if I got to but it may be good to learn what caused it to prevent it from happening in the finished projects. is this made in Rpg maker? if so I maybe able to fix it with a save editor.