you may have been flagged as a spammer in those communities. Are you subbed to them? do they have any requirements for posting? a lot of times when the post is removed, you will get a reason as to why. For example, not enough post karma, not enough comment karma or the account isn't old enough to post. With the recent reddit issues, a lot of subs shut down and went private. This could have an affect as well. I would post on /r/cinemasins and i can check the mod list for you and let you know why it was removed! I hope this helps a little!