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Incorrect miles after sync

Just finished up a mountain bike ride on my normal 10.5 mile loop. I rode the same loop so I can keep track of my improvement progress. After the sync it shows I rode one mile less, but the time and the map show the same path as I always ride. Anyone have this happen to them? The first screen shot is my normal ride, the second one is from tonight. I’m using a Fenix 3 to track my rides and have been using it for a few years now with no problems. 


 

    1. The GPS in my 645 started giving inaccurate readings in the past few days.  I checked routes using the course creator and clearly off. Ex. Watch reads 2 miles for a distance of 1.  On the treadmill it is also adding a mile to actual distance.