occasionally I get kicked from the server when trying to add an ability. when this happens I will have the ability added but experience is refunded and the ability totem is refunded. this leads to a lvl 5 exploit

What's the reason for kicking?
Does the client see something?
Does something appear in the server logs?

will add more information the next time I see the issue again. I had it several times but it does not seem to be fixed to specific abilities. My cousin had the same issue