Bought 300 hours of Cloud DVR space but Daily Update removes it

We have 3 TV boxes, premium DVR service and I recently purchased the extra 300 hours of cloud DVR. Before this, our DVR was 90% full. So I saw “Increase cloud DVR storage” (paraphrasing) at the bottom of my list of Recordings (Xfinity>Saved>Recordings). Instantly, our DVR went from 90% full to 45% full. Great! That’s what I wanted! However, the Daily Update ran later and when it was completed, my DVR was back to being 90% full again.

So, I went in the Xfinity app and purchased the 300 hours of Cloud DVR again. And it, again, instantly increased our DVR from 90% full down to 45% full. Then, sure enough, when the next Daily Update finished running, the space was back up to 90% full. I’ve repeated this 3 times now. Why is the extra space being added then removed again???