Swim Heartrate Problems

The AI feedback in swim sessions sometimes states a different average heartrate than reported in the workout statistics. For example, today’s swim stats had an average HR of 120 (actually it should have been 122, but that’s another issue with how the data comes in from Apple watch > Strava > Athletica). The AI feedback said my average HR was 105 and based commentary on that number. I’ve noticed this before. Thanks much.