I invited friends to a survival world and it turned off achievements

I had invited a friend onto my survival world because he wanted to see it and it switched me to op and my acheivements didnt work. Now im op on all survival worlds i have even though i never turn it on, please fix this I am very sad about loosing the 'overpowered' and 'fruit on the loom' achievement as i found two enchanted apples on that world and i feel like all my time getting them was wasted