Receiver not recording new episodes

Why do certain shows have the date of the show (1978) making the receiver think that the episode is not new therefore it doesn't record it.

ABC World news and The Price is Right are two that I record and recently the date changed in the description of The Price is Right changed to (1956) and it didn't record because it thought it wasn't a new episode. The date for ABC World news has been wrong for a long time. (1978)

I have it set it to record all episodes to get around this but why is...

Receiver not recording new episodes