strange rendering of coastline

Hello,

There is a strange rendering issue in the north-west corner of Germany, close to the border with the Netherlands. It looks like a part of the coastline isn’t rendered correctly. May someone knows what is going on and even better, can fix it?

See the link for the location.
http://www.openstreetmap.org/?lat=53.53347&lon=7.15056&zoom=15&layers=M

maybe the solution can be found at help.openstreetmap.org → enter the word coastline for search …