Poster submissions

I have been providing images as posters for various movies from time to time and they all have been approved for submissions. Now just recently my contributions have been approved for publication but then later declined due to not meeting "contribution guidelines." I have read these guidelines on poster submissions, and it does not tell me exactly what I am doing wrong. I am following the instructions as outlined in those guidelines and exactly in the same manner as I have been doing for those posters that were previously approved.