Le champ "Navigation" fonctionne ou pas ?

Mostly likely it is not included according to current configuration or not order the way you expect it depends on

-- current category or if this is not set then to main's category configured ordering


Please examine these first: (and then post back here with what you find)
-- How many items does the CURRENT category of the item have? NOTE i say current category !! this is included in the URL (if you temporarily enable pathway (breadcrumbs) you will see it in the pathway
-- What is the ordering of the CURRENT category ?

Regards