The workout time shown by the Activity app can be different than your actual run recorded with the Stryd app on your Apple watch. When you use the manual start option within the Stryd app, your watch will connect to Stryd and GPS and wait for you to start the run. The Activity app considers the moment your watch is ready to record as the start time of the activity, even though you may still be getting ready to run. So, your workout time in the activity app is your workout time + time the watch was ready but not recording. This affect average pace shown in the Activity app.

Your data stored in the Stryd platform is not affected.