"Trophies cannot be earned on this world" despite no cheats on a legit survival world

My completely legit survival world of a year and a half is now telling me I cannot obtain trophies and I have no idea why. This really bums me out as is this my first proper world where I have greatly thrived. The only reason I can think of this happening is that I made copies of the world to mess around in but I seriously doubt that is the case. It would be a lifesaver if you guys could help me out because now playing this world just feels depressing because it feels fake