There is an issue in the quest 26343. Indeed, even we kill the correct creatures, we can see the item we need to complete the quest, but for unknown reason, we can't loot that precious item. ( 4053 )
Differents useful links:
https://www.wowhead.com/quest=26343
https://www.wowhead.com/item=4053
Differents useful links:
https://www.wowhead.com/quest=26343
https://www.wowhead.com/item=4053