treasure isle chest bugged?

Hi People!

So i just got my troll druid leveled up to 90 3 days ago, and i wanted to get gear from the treasure isle chests. On the day i got 90 i traveled to the isle and got some of the chest, and got gear. The gear i got was not really good for my class (Balance). So today I wanted to get some more chest, but they did;t respawn yet, or they just disappeared. I thought someone else could have taken the chests, but there was no one on the isle....

So my question is: Are the chest bugged? Do not they return after a day? Or can i only get them once?

I hope you guys can leave a answer for me :)