Hi cyril31,
your recent changesets have left behind a lot of errors in the OSM database regarding overlapping ways (blue markers):

https://tools.geofabrik.de/osmi/?view=routing&lon=1.86911&lat=47.89423&zoom=12&baselayer=Geofabrik%20Standard&overlays=duplicated_edges%2Cduplicated_edges%2Cduplicated_edges_areas

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