It's normal for a slow-bloated Facebook bounty post to update. Also, if their Facebook page does not update the new post, I think you should work on the old posts and then post the report to the admin. That will help you not lose skates in that bounty campaign.
That's right, you need to keep working. If there are serious delays, you can contact the project owners or those who lead it. For example in a telegram. Most likely you will answer.