Hi  Guillaume,
this changeset has created errors in the OSM database regarding overlapping ways (blue markers):

https://tools.geofabrik.de/osmi/?view=routing&lon=-1.63602&lat=46.67382&zoom=14&baselayer=Geofabrik%20Standard&overlays=duplicated_edges
As you may know, this kind of error irritates routing software and looks ugly on the maps.

Can you please fix this?

You may also like to educate yourself about how to edit hiking routes properly:

https://wiki.openstreetmap.org/wiki/Hiking#Tagging_walking_and_hiking_Route_Networks

Kind regards
Guido