itunes description column question

In itunes when you have a file, like for example a TV episode, all the appropriate info is input into the 'get info' window. If you select to have to 'description' column visible, as I do, there is a small gray circle with a lower case 'i' in it, which I'm sure we are all aware of, when you press it a basic little window opens and shows the Episode details like the show, episode name, and description. However my issue is, that when I open that window, I don't see the episode description in it. I'm trying to figure out how to get it to show that. It works on certain episodes but not on other so I'm missing something I guess but I don't see the solution. Any ideas, would be appreciated, Thanks.