TV Show shows on AppleTV but not in iTunes library

I've been adding TV shows from various sources to iTunes for awhile now and watching them on my TV through home sharing to the appleTV. For awhile this has all worked great. However, tonight I've run into a strange issue: On the AppleTV, under the home sharing from this local computer, I am seeeing episodes of shows which are not listed in the iTunes library. For example, one show in iTunes shows me episdes 11, 12 and 14, whereas on the AppleTV, it is showing me 11,12, 13 and 14! I count 11 shows that have missing episodes.

I have a workflow setup where the video files are tagged appropriately, then placed in the "automatically add to itunes" folder and iTunes handles it from there. I have my media folder location setup on an external drive and iTunes set to keep my media organized. Looking in the itunes folder, I see the files for the "missing" episodes are there. When I try to play the episodes on the AppleTV, they play fine.

I tried to "add to library" again the missing episode, but nothing seems to happen. I have restarted iTunes and the computer. Tried disconnecting and reconnecting the external drive. I even looked in the "iTunes Library.xml" file and the episodes are listed in that file.

Any suggestiosn on how to get what is showing in iTunes to sync with what is actually in my iTunes library?? Thanks for any advice!