Morning report shows Pulse Ox from "1 hour ago" vs sleep & health status show overnight average

This morning my morning report said "Pulse OX 98% 1 hr ago" but I had just had a message regarding my health status which showed Pulse OX as 97% overnight average, as shown in the sleep statistics.

Why does the morning report show the SPO2 at a point in time rather than the overnight average?  Seems inconsistent.

Not that 1% difference of an inaccurate measure is of any significance...