When purchasing additional bounties from Zavala, I saw that after two consecutive purchases only one bounty was actually acquired. Notice in the video that I started at ~115k glimmer (after dailies) and after five additional bounty purchases I end up with three and ~100k glimmer. Bottom line: I was charged 15k glimmer for five additional bounties, but two ghosted and I am left with three. If I exited Zavala's menu after purchasing and interacted with him again, the additional bounty was acquired as expected.