Versa tracks calories incorrectly

[Modesty78]

Today I did my regular exercise routine 30 minutes on the elliptical and approx 30 minutes weights. I did the same routine on Thursday. Thursday I did 35 minutes weights, burned 261 calories. Today I did 31 minutes and burned 123 calories. Even accounting for the 4 minutes more, and maybe a tiny difference in the routine, it shouldn't be halved. What could be the problem?

[JohnnyRow]

Did you track them manually or letting it auto-recognize exercise?

Were weights and elliptical separated and 2 separate exercise sessions?

For any calorie questions, my first look is at heart rate during the workouts to see if they seem reasonable.

[Modesty78]

I activated the specific training types on both types of exercise - I always do, so no difference there. The heart rate seemed very low on the weights section. On Thursday I averaged 127 bpm, and today only 108. 

[JohnnyRow]

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@Modesty78 wrote:

I activated the specific training types on both types of exercise - I always do, so no difference there. The heart rate seemed very low on the weights section. On Thursday I averaged 127 bpm, and today only 108. 

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So either today according to your heart rate, you were not exercising as strenuously, or else the heart rate recording for one or both were not accurate.  I would try looking at the heart rate detail as well as just the average to see in thee any clues there; for example were there stretches of unexplained lows or highs either day?

[Modesty78]

So, looked at the heart rates, where Thursday the impact accounted for 36 minutes of activity, this time it was 7 minutes. So somehow, I managed to not be active for quite a lot of the exercise time. 

How can I avoid that in the future?