The only thing was that I paused two times to cross the street waiting for the green light. I don't know if that is the problem.
The only thing was that I paused two times to cross the street waiting for the green light. I don't know if that is the problem.
If you're talking about the Half-Marathon personal record, then your activity is about 100 meters short. A half-marathon is 21.1 km, not 21. Still, you can manually set it as a personal record. I don't know how to do it in the mobile app, but go to the Garmin Connect web site, select the activity, click the small cog icon in the upper right corner and select "Set as PR".