Weird glitch with mine_world and world

It seems like mine_world and world are acting as if they are the same world. When I do /time mine_world day, it doesn't do anything, but when i do /time world day, it works.


What is wrong

I found out that they are actually the same world. but o don't understand why it generated like this... I used multiverse...

EDIT by Moderator: merged posts, please use the edit button instead of double posting.