Doubts about Heart Rate Widget

Hi everyone!

I have a doubt about Heart Rate Widget. I don´t understand max and min values shown.

In this particular case (screenshot attached) my HR was 39 bpm but the min value in the widget is 44 bpm.

Related to max HR, as you can see 173 was my max HR for the last 4 hours, while in the activity shown in the widget mi max HR was 178 (as I can see on Garmin Connect App).

Does anyone understand min and max HR value shown in the widget? Are they a kind of average value?

Thanks!