Works fine for singleplayer but its stuck on lvl 1 even though RPG mod has mapped up entities to lvl 20

Yea the mod has to get installed on the server too otherwise it doesn't work

basically, hadn't had it enabled when I made the server hours later I just found this addon and difficulty was already doing its work but everyone was still on LVL 1 when I make a single-player map it works fine see a couple of lvl 5 etc