Originally Posted by Daldaen[You must be logged in to view images. Log in or Register.]
This was a specific issue in Kedge Keep for a few years on this server. The only way to fix was to get in melee range and retarget (empty target window with ESC so that you have nothing targeted and then the next time it melee'd you it would target them with updated health).
Try retargeting the mob and see if that does anything.