mana draining on sit/stand

[Kaedain]

Hello, so i just started to play again on this server. and was getting around to exp'n and a strange bug where ill sit to regen mana, and get say 60mana but whenever i stand up my mana will be drained almost empty and ill be sitting with like 12 mana... was wondering how to go about fixing this, ive tried camping, and relogging the whole client with no results