Possible Instance Bug?

I had this happen last week and didn’t think much of it, but then it happened again today. I finished an instance, it said I had an Instance Key, but there wasn’t one in my inventory.

as you can see all 4 chests r closed and says i have no key. :confused:

just something to look into when you have time


I’ve had this happen to me 3 days in a row now, all the same instance. Can this get looked in to?