So I had to fix a map, and downloaded it, mcedited it, and uploaded it, and changed it's name to world.8. I set the world path to world.8 to see if it worked, which it did. I changed it's name back to world and replaced the old file. I also erased world.8 from multiverse config. But on startup it keeps generating the worlds, world.8, world.8_nether, world.8_the_end.