If you already have an Exotic Bounty from that rotation, it won't let you take that a second time before completing the one you already have. This is something I noticed with Super Good Advice's bounty.
English
-
Ah OK, yeah and I already have a bad juju bounty active, so that was probably it. Since I will soon have all five bounty weapons and I don't need a second pocket infinity, I will probably just gave a new super good advice for the free shard.