i ran in a official half marathon race today 13.1 miles 2.05.15 strava has logged run at 12.70 miles how can i fix this
Unfortunately, sometimes even an “official” race route is short, as some organizers don't bother with getting the distance properly measured and certified. (A local “half marathon” is notoriously known to be around 20k, for example.)
Anyway. You can try the “correct distance” feature - you have to open the activity from Strava website, it's not in the app. Strava will recalculate the distance based on the map data, and it might recognize the HM distance afterwards.

In addition to what
Other than the “correct distance” option mentioned above, another option is to just add a manual entry for the event with the half marathon distance and your official race time.
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