The UUIDs in my playerdata folder for my minecraft server keep changing or deleting themselves every time my friends and I log out of the server. This means that every other time we log in to the server, we will end up with the default spawn location and our inventories completely wiped. I have tried uninstalling and reinstalling all of the old server files and minecraft itself, and I do not use any mods or plugins on the server. The UUIDs keep creating old_dat files of itself before deleting itself. This has made my minecraft server unplayable.