Elevation gain overestimated in route elevation details

Hello,

yesterday I went on this route https://connect.garmin.com/modern/course/58394868 . When I checked elevation details of the route on my watch, it says 2011 gain meters. But the route itself, in garmin connect, says gain around 300 meters. Is this known issue?

Fenix 6 - 16.60.0.0