It is becoming a reoccurring scenario, that after bounty ends, the project team will start saying things which weren't agreed on or even giving excuses why the payment will be delayed, some might go as far as re-auditing the spreadsheet just to find excuses on why they will not pay or reduce the reward, and in all these what can be done? Nothing because it is stated in the bounty thread that the team can change the rules at anytime. It is only very few bounties that the team always stick to their own side of the agreement. What surprises everyone is, during the bounty period, there will be no issues from the team but after the bounty the issues surfaces.
Furthermore, I do not know much about those two bounties, but that is what most team do, delay the reward, and when the price reduces badly they pay, in most cases, bounty hunters will hold and expect a good price later on and in some cases, the project becomes abandoned and the reward worthless. 
Nevertheless, there is little to nothing bounty hunters can do, other than researching every bounty thoroughly before participating and also asking the team the right questions if possible to be on the safer side.