DVR storage space issue

Hello all,

I've recently switched over to Xfinity and I noticed my storage % on my dvr seems off. I currently have 15 episodes recorded all ranging from 30 min to 1 hr and the box is showing it is 87% full. Is this correct or is this a common error that occurs? If I need to provide anymore information please just let me know.

Thanks in advance for any and all help!