Garmin OSM - Contour lines rendered over sea

Hello forum,

My contour lines are rendering over the sea. From a drawing order pov this makes sense, contours have higher draw priority and are transparent, but from a map point of view, it makes no sense. Can I change the draw order of the sea tile in some way, or should the contour lines be cut at the sea border? Or is this something else?

Example: http://www.tiikoni.com/tis/view/image.php?id=a956d7d

Thanks for your help

Contour line data and coast line data are from different sources, and sometimes such minor differences become visible.
You could check the coast line with imagery (Bing, MapBox etc) and edit it - but depending on the source of your map, it might take several weeks (!) before the update becomes visible.