Previous day HS reduces during the ongoing day

I noticed the following behavior happening:

(1) at the end of the day before sleeping, I check my HS for that day. In the attached screenshot called 1.jpeg it was 95. And I usually max it out during the day, and this was the max.

(2) Next morning, when I start Rolla for the first time, I get the new HS for the current day. The HS for the previous day is still as it was (95) and seen in 2.jpeg

(3) Once my HS starts increasing, because I get steps and active calories - something happens and suddenly my HS for the previous day is 5-8 points lower. As seen in 3.jpeg

(4) As my steps and active calories get closer to the max, ie. as I max out the score for the current day, the yesterday HS grows back to the one that was under (1).

(5) I’ve noticed this pattern for 10 days now, and the only day it didnt occur is on Saturday 24th August, when my max score on that day was 86 (compared to the 95 previous day) - not sure if this plays a role.

The change in HS for the previous day is not just display only because it impacts the average HS for the week, HS, as well as, the HS used on the leaderboard.

This is not really visible or plays effect with people that max out their HS in the morning, but it is highly demotivating for people building up the HS during the day.