Hi Moritz_en_bici,
your recent changesets have added errors in the OSM database regarding overlapping ways (blue markers):

https://tools.geofabrik.de/osmi/?view=routing&lon=2.36579&lat=41.63894&zoom=14&baselayer=Geofabrik%20Standard&overlays=duplicated_edges

https://overpass-api.de/achavi/?changeset=160673261

As you may know, this kind of error irritates routing software and looks ugly on the maps.

Can you please fix this?
Kind regards
Guido