Minecraft thinks my 1.12.2 forge world is old

[bmstein184]

So, I just wanted to go to my world in Minecraft, and when I hovered my cursor over the world it said it was saved in an older version, even though I'm playing in the same version it was saved in.

It also has problems with me getting blocks from the creative menu, I have to hold left click while dragging the block and it will go back if I stop holding left click. It has also been doing the menu problem in completely mod free snapshot 20w18a but says the world is fine. My Minecraft world folder has had a contamination breach and another world has some duplicated files scattered around the .minecraft folder, as well as a few other files. Any way to fix??