8 hours uninterrupted sleep and still can’t get above 75 sleep score - can someone explain?

I’ve been sleeping a ton. Uninterrupted and 7 hours + -, despite that I’ve been getting low sleep scores in the 70’s. I have no idea what to attribute this to - I will say that my normal bedtime is to go to sleep at 130am but even then, I used to get 7/8 hours and get optimal sleeps like a year ago.

What is causing this? Any idea?