Due to some old posts has been deleted from time to time. Minimum post of 15 are going to become 20 or more because some bounty manager are counting the total post minus the previous week posts. Though you posted 25 post in one week, sometimes if you are unlucky you will not receive stakes because the total posts are less.
Do you agree that bounty manager team must count only the recent posts in the inclusive days of the week?
I think this problem does not really exist. Good bounty managers check the posts that you wrote according to the dates. So if you wrote this week the required number of good posts, then it's easy to check.