Apple Watch SE showing inaccurate respiratory rates during sleep

I have an Apple Watch SE, os 26.2. I don’t wear it while sleeping, but it shows a long list of respiratory rates at times when I was definitely asleep. How can this happen? I have relied on other health data but only recently activated respiratory data; this makes me distrust other data.

[Re-Titled by Moderator]

Original Title: Hallucinated respiratory rates?