Lower HP than DPS is definitely an indicator that something is up. Is your right side equipped with even close to at-level gear? If all of your other gear (head, chest, arms, etc) is at level 50 then I'd bet money you have an accessory issue (necklace, rings, bracelet, etc.). Do you have tomestones of poetics? If so, you can go to Mor Dhona and get the stuff you need for your right side.