The plugin gives the player experience for any action

[op-lum1x]

I had a problem that players received experience for everything, for taking damage, for placing blocks, for pressing the right mouse button. I couldn’t understand what was causing this and started disabling all the plugins one by one, and when I disabled multiworld it stopped

[Dev7ex]

Please check this on spigot and not paper and check again if it is really due to multiworld. Multiworld does not work with experience points anywhere