why is the date added incorrect on purchases

I have several TV series that I purchased from the iTunes Store. The Date Added is always wrong and it is the same for most all shows. Currently it is 9/2/14 for most shows and 10/2/14 for others.

The Date added use to be correct but it has been wrong for a long time.

I am using the latest iTunes 12.1.0.50 and the latest OS 10.10.2

Does anyone have any suggestions no what is happening?