change UUIDs at players

[Alien0-7]

Hi, I have a problem in my server, my problem is when a player joins in my server every now and then the UUID changes and this compromises all his progress, for now I was simply adjusting changing file names with the correct UUID but this thing starts to happen too often, I probably set the configuration files incorrectly.

Backend del server (2): Hub (paper-1.20.1), Towny (paper-1.20.2)
plugins Hub: https://pastebin.com/Bxv576Y0
plugin Towny: https://pastebin.com/XGsJvhcw

Proxy server: Velocity (velocity-3.3.0)
plugins: https://pastebin.com/PZQa8JvT

backend config: https://pastebin.com/y36vMtA3
proxy config: https://pastebin.com/hU0BmbyC