I've been playing this minecraft world for a couple of weeks, never changing the gamemode or anything. When I started using the mod, in the menu, it says, "Created In Creative." It's not like a huge issue or anything, it's just a little nitpick. Is there anything that could've gone wrong?

Every world with cheats is considered "Created in Creative" in the LE

I never used cheats or enabled cheats though.

World data says otherwise... (remembering that cheats are the same thing as commands)