I have my calculations for HRV set to entire sleep + mindfulness. If I clear my cache and rebuild I get results that are in line with my Garmin data (23.6). I quit the app and reopen it and I get a lower number (19.5) until I clear the cache again then it's back where it is in alignment with Garmin (23.6).

Ignore that RHR, something has been wrong with my AWU lately where it's reporting weird values or none at all until the evening.