Agree, applying the standards and beliefs of today to 60-70 years ago is quite tricky though. They needed the space, media was expensive and so reused. They just did not foresee repeated content as being valuable… today… we like repeats!

This was common with most major national broadcasters: https://en.wikipedia.org/wiki/Lost_television_broadcast

Quite possibly a fake with fake capacity. Did you buy from a known retailer or a random seller?