I had this issue since the dlc, and was getting the sane ones you are. At one point i literally had all 3 in my inventory. Got another bounty. It wouldn't let me choose any until i completed one, and then i only got to choose the one I'd just done.
Last week i finished all i had, and deleted the missive i just got. Next one i got gave me different options finally.
So, i THINK the issue arises when you still have a bounty from the last time you got one. So clean out your bounties BEFORE you get your next missive and see if that helps. Good luck
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I always deleted the bounties since I first competed them. I now have all three bounties I've gotten dispersed between my 3 characters and not even 1 exotic bounty has dropped since then.
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Huh. Well that's what worked for me. Or maybe it was being random and screwing me the whole time. Idk. But you're more likely to get an exotic bounty of you turn in a bunch at once