keeping library mode current

I have another, similar issue which didn't really belong in it's own thread and figured I might hijack this one since the original question seems answered.

Using the "recently added" view, often after adding new shows to a series, that series will have an additional two or three episodes which appear in the "recently added" view. It only happens with some series and I don't recall it happening with movies.

For instance, 30 Rock episodes 1 and 4 were re-appearing each time I would add a new episode each week. Has this been discussed elsewhere and I missed it? They are files on a network but the episodes that keep re-appearing are not being modified each time (nor are the .nfo or .tbn sidecar files). Not even being accessed in that week.

r28256. Windows XP.