This might be a connect/app issue … i
noticed that if start a walking session with gps on the vivomove watch, AND run the hiking app Gaia GPS on the iPhone , I get double mileage reported on Garmin connect but normal on the hiking app. The Garmin step count looks inflated too.
I often use a Polar chest strap with GPS & the mileage is pretty similar.
Any way to make this rational?