Changes in new algorithm

in July my same daily workout started showing 25% less calories than before. Daily 3.8 mi walks at about 3 mph now show maybe 25 -30 calories per mile and sometimes 0 strain. Seems as though walking totally devalued. Why is walking so much less than it was previously or with other apps

When they updated their algorithm in July what broke wasn’t the calorie count it was the heart rate. An all out 8 miles now and apparently i’m only in zone two despite being unable to catch my breath afterwards. Covered in sweat despite the cool temp. apparently now my heart rate never hits 150… whoop is effectively useless now