Forerunner 965 firmware 20.26 Resting Heart Rate too high

Not sure if this is related to the other recent HR issues. I recently upgraded to the 965 from 955. I wear the 965 while sleeping and check my RHR upon waking. 

For some reason,  the 965 is reporting a RHR 8-10 BPM higher than what I saw on the 955. For example,  today the watch reported my RHR as 73 but I can see in the HR chart that my HR was in the 64-67 range for several hours during night. Shouldn't those lower readings be used to calculate RHR?

I.e. the actual HR readings appear correct but the determination of RHR from those readings seems wrong.