I created a vanilla Minecraft server (1.9.4) a few weeks ago, and ever since, chunks have been regenerating or moving. Just a few as of now, and I dont want to remake the world so I just let it be. But before and after this had happened, on single player, my worlds would just vanish. I was playing on a new one last night that I had created a few days ago. This morning when I opened Minecraft again, it was gone. I opened .minecraft/saves and clicked "Properties" and then "Previous Versions" to attempt to fix it, but no dice. I tried to copy and rename it, no dice either. So my server was broken, and now my worlds are going too. Something is wrong.