Right, I have tried this out on your island pertti.
One Higgens boat, with driver + 5 soldiers In Cargo.
I have set the GET OUT waypoint on the area I want them to disembark.
They nearly always turn and head elsewhere.
With very steep coastlines it seems to work fine.
So maybe the steepness of the beach is a factor.
But, I also think where you place the waypoint also is a factor.
I have got it to work on your map by placing the waypoint only slightly beyond the last blue contour line on the coast. This of course was after I adjusted the slope of the beach slightly.
I don`t think this is a bug with WrpEdit, because I can duplicate the same strange behaviour on ALL islands, even Everon and Malden.
Planck