Why does Garmin swim data show more laps than the app?

For Garmin swimming activities, the laps array is mapped from Garmin 'lengths' (one per pool length) rather than the laps the user marks on the watch, which is…

For Garmin swimming activities, the laps array is mapped from Garmin 'lengths' (one per pool length) rather than the laps the user marks on the watch, which is why counts differ from the Garmin app. This is an intentional mapping.

Contact support if your use case needs watch-marked laps.