I noticed some time ago that the data for Germany is not in sync with the data on OpenStreetMap.org.
Today I made a screenshot to illustrate the issue. Where do you take the input data for your maps from? Because OpenStreetMap.de is also behind OpenStreetMap.org.
I'm talking about changes that are several months old... I'm aware that it takes time for the changes to appear, but these changes are made quite SOME time ago.