Bukkit

Hello, I note a problem on my localhoster server: when I win experience, she decrease instantly, but she is keeped when I level up. like this. (I use this plugin with Item lore Stats but this problem come only of RaC, i tested it alone turn by turn). Do you know what is the source of the problem? here is the link to my RaC config.

http://pastebin.com/Q5z3g7dK

Thank you for help me ^^