Hi StC,
this changeset has created overlapping ways:

https://tools.geofabrik.de/osmi/?view=routing&lon=5.63961&lat=44.69768&zoom=13&baselayer=Geofabrik%20Standard&overlays=duplicated_edges

https://overpass-api.de/achavi/?changeset=150873051

I have just fixed this.
Guido