Instinct Odometer vs. Garmin Connect Totals

Hello fellows!

I found very interesting gap between inner odometer in Instinct Watch and Garmin Connect .

At 01/01/2021 I reset all in-watch odometer and start my year. Today I checked my in-watch odometer and got 2669 km. But Garmin Connect statistic in PC and App show me that my total distance since 01/01/2021 is 2718.59 km.  Difference GC vs Watch is 49.59 km.

My question is how it can be? I use watch for one sport only. All sessions saves immediately after activity stops. No activity was deleted since January 1st 2021.

Do any have same ... bug?