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Incorrect distance recording

Hello, today I did a 15 mile mtn bike race, to my surprise I crossed the finish line and my garmin said I had only traveled 13.40 miles. So I checked my Garmin vivoactive 4 which displayed the correct distance of 15 miles. Any idea why there would be such a discrepancy between the two devices? 

I have been using the Garmin520 for over 4 years and never had issues.

I do have a non Garmin chest heart rate monitor paired with the 520 but nothing else. 

I always wait until satilites have been located and GPS is locked before starting my rides.

Thoughts or fixes would be helpful. Thanks.