Total time split in all HR zones < total running time

Bug Reports
1

IMG_0107
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As you can see for the screenshot, the time in all HR zones total 26 minutes, while total running time is 28 minutes (7% difference).

HR zones are defined with numbers (vs percentage) and HR was recorded with an H10 linked to an Apple Watch using the WorkOutdoors app (which uploads to Strava).

2

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In this other run, I switched to Strava with my iPhone as my Apple Watch battery was low.

In this case, the times match perfectly (32 min for both total and sum of times at each HR zone).