Duplicate activity detection

Hi guys,I sync with strava and fitbit and usually take my fitbit off when cycling so it doesn't double count my activity but today I left it on and noticed later in the day only 830kCal registered by Fitbit and when I checked strava I had logged 840kC.
Since the strava activity is not in my feed does that mean that Cronometer detects similar date/time and calorie activities from different sources and only count one?
If so, that's very clever and great.
Will

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