hearth rate wrong in walking

[moein rezaei]

Hello, after new update 2.35.34 , my suunto vertical solar watch shows the heart rate correctly in the trail running activity when I am running
but when I walk due to the high incline and with a constant heart rate, it shows the heart rate is down.
My actual heart rate is 150, but it was showing 100 and less while walking
@isazi and @Brad_Olwin