I faced the same problem today. The number of posts when I enrolled into signature campaign was 1632 and till now I made 31 posts. Tomorrow will be payment day and I see in my profile 1655 posts only. So by my profile I made only 23 posts. I have no time to make 7 posts to finish the campaign's minimum, so I am going to stay without payment for this week and it's horrible, cause of bitcoin is my only job I have.