Players gets their xp reset to 0 after they use /home from a different world but keep it if used from the same world, if they rejoin the server the XP appears back to normal.

Forge?
FE?
Does this happen also with only FE loaded?
Logs if possible (use pastebin or gist)

I am thinking this is a client side de-sync issue. To verify, please confirm that the player levels show back up after receiving an exp orb.