Self Credits for Documentaries

Hi, I was adding credits for a documentary and they were all accepted except cast credits which were all rejected. All of the people appear as themselves. They are not listed in the end credits, but they are all credited throughout the movie, there are captions crediting each of them as they appear on screen. I've added a number of documentaries before with such credits and they were all accepted, has something changed? Is there a way to add these credits?