High DVR percentage, low number of shows

Had to get my cable box replaced 2 weeks ago because on demand was not working at all with it. 

Since then my dvr percentage has been incredibly high. Right now I have 15 shows and my dvr is 43% full. None of the shows are in HD and the longest show is 1 hour. With my old cable box 15 shows would be around 16%. 

Why such a huge difference? I am worried that shows may start to be erased with such a discrepancy between percentage and number of shows, especially since the DVR is only keeping shows for about 2 days. Fortunately I am able to watch the shows before then at the moment but all the shows are being marked with an hour glass and a 2 day countdown to erasure.