New "name of server" files; Server resetted

[BEEsheep33]

Yesterday evening a Player from my server noted to me that the server was a different seed and all our progress was lost, I looked at the server files and there were 3 new files

Old: world, world_nether, world_the_end

New: world, world_nether, world_the_end, spooncraft, spooncraft_nether, spooncraft_the_end

(Spooncraft is the name of our server) I deleted the spooncraft files to See If it would go back to normal, but that didn't work. I didn't do anything that could possibly be the cause. Can I change my server back to before this reset and how do I prevent this from happening again?

Update: the spooncraft files are back again, I didn't do this manually, it just happened for some reason

Edited April 26, 2020 by BEEsheep33

[Migins]

A lot of worlds were renamed during the maintenance, make sure that none of these are your own world.

If you still can't find your world, contact support here.