Running Pace Trend iPhone OS 14 incorrect

Hi, my average running trend has been going down for over a year, with runs from 9 minutes now down to 8 min per mile. For whatever reason Apple shows my running trend pace at 13 min a mil. Does anyone have any idea why? Or what data it shows. Right below the trend it accurately shows my daily pace each week in the 8 minute range. Is this using other data sources or including just me walking around during the day? I do mostly Apple runs and peloton runs in the workout app, but I also do other workouts, like high intensity and such where I don’t run.