Watch distance vs Connect distance

This is minor, but I'm wondering why the Connect app distance after a run is always 0.01 km more than my watch distance? Example: Latest run was 9.00km on watch, that syncs to Connect which shows as 9.01 km.  Then what's also weird is Connect links to Strava and it'll show the watch distance of 9.00 km.  Does Connect app recalculate distance based on watch GPS map rather than just use the watch GPS?