The poster tagging on this site is very inaccurate. I doubt if there is a rules and guideline.
Few months ago, I requested for the merger of "whitehouse" and "white house".
Now, I see tags that have nothing with the posters. We can't correct such.
Take a look on this: http://www.movieposterdb.com/poster/0f377ee6
This is just one of the several pages that have faulty tags.
Time to clean your poster tagging.