Dvr multiple duplicate recordings

Why is the dvr recording multiple copies of the exact same episode??

To be clear, im not talking about new/repeat or the such. I mean. for example, i have 4 recordings of 'whose line season 4 episode 7' . All of them the exact same episode. (and i got to 4 by the time i was tired of scrolling through them. There could be more.) 

In the menu UI, it says i have about 140 different episodes recorded and available. But i have a total of 180+ recordings. Suggesting that i have over 40 duplicate episodes. Its really annoying. - We only need one copy of a single episode. And it eats up a lot of room doing this.  - And since you can only scroll through them so slowly, its really hard to see whats a duplicate or not without it taking 40 hours.