Quel'dalar bug

I've done all the quest but was unable to recover it from sun well here is a screenshot

http://prntscr.com/eca9jh

Happend to me, abandon the quest and pick it up again outside the instance, watch the RP again and then you may pick it up - if you did the quest in a group with someone else doing it along side you, only 1 can loot it

thanks a gm talked to me to to do same i've done the quest