Blizzard have announced they will be disabling loot drops and reputation gains from all Dragon Isles rare mobs due to the daily limit not working properly. They hope to fix the bug and reinstante loot and reputation within the next few hours.

Rare Drops (Source)

With a temporary hotfix, we recently made it so that all rare enemies in the Dragon Isles, such as Cinta the Forgotten, Windseeker Avash, and Drakewing do not drop loot or reputation. We’re working on a bug that’s causing drops from rare enemies to disobey the daily loot lockout.

We expect to have that bug fixed in the next few hours, and at that time, we’ll turn their drops back on, and they should drop their goods on a daily basis going forward.

Thank you for your understanding.