Instinct Solar Tactical Double Calories Count

I think Garmin Connect counts my runs in steps and therefore steps in calories ... and then adds calories to that for the run.
For example, I start my morning run with 150 active calories and run about 10km, GC estimates that I burned 800kcal during this run, but in Garmin Connect I have 1650 active calories, so Garmin adds 600kcal.
I dont have connected any apps to GC or even on my phone. 

Any ideas why it looks that way?

  • Instinct uses only HR and HR Variability for the Calories calculation. Steps are irrelevant, as long as you did not turn off the HRM.

    Active Calories are not equal to Activity Calories. Active Calories are all Calories burned over the RMR (Resting Metabolic Rate), regardless whether you record any activity or not. In contrary, Activity Calories include all calories burned during the respective activity, it means the value includes also the RMR.