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Treadmill doubling my mileage

I run outside and my pace and mileage is correct, I use a HRM-TRI and heart rate is dead on. However after my run on the treadmill today my mileage doubled to 7.3 and pace was around 5:50. Way off as I only ran 3.65 miles at an 11 / min mile. 

I’m using the latest Garmin 945 firmware. 

anyone else notice this or have a solution?

thanks