Any way to fix wave detection?

In the attached photo I've got my GPS track from a surf session below and the recorded waves above. I caught several waves this session which you can see as the dark straight lines in the Strava screenshot. But Garmin missed all of them.

Recorded on a 2S solar surf. 

given that this is specifically a "surf" watch I'm surprised how bad the wave detector is. Am I doing something wrong?