Hi Victoria Herring,
Welcome to the Support Communities!
The article below confirms the correct way to edit video information.
If you have several files like this that were downloaded from the iTunes Store, I've included a link below to report the issue.
Playing and managing content in iTunes
http://support.apple.com/kb/HT1399#3
Each audio or video file in iTunes has several settings and tags that can be easily modified. These options can be accessed by selecting any file in the iTunes browser windows and selecting "Get Info" from the File menu
For videos, the Video tab allows you to specify if the video is a movie, TV show or music video. You can also set episode information for TV shows.
iTunes Store & Mac App Store: Seeing your purchase history and order numbers
http://support.apple.com/kb/ht2727
Cheers,
- Judy