Hi Jan,
From the logs you sent, we can see the following folders cannot be synced due to the limitations and restrictions:
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C:\Users\JACKENHAUSEN\Documents\W. shared\SharePoint\T\Documents partagés\05 Expat Welcome Desk\HABITER A BRUXELLES\INFOS\Un bail qui démarre dans le courant du mois, et alors_ _ SNPC_files
C:\Users\JACKENHAUSEN\Documents\W. shared\SharePoint\T\Documents partagés\05 Expat Welcome Desk\HANDICAPE - Gehandicaptenzorg\Handicap\Service bruxellois francophone des personnes handicapées_files
C:\Users\JACKENHAUSEN\Documents\W. shared\SharePoint\T\Documents partagés\05 Expat Welcome Desk\INSCRIPTION & SEJOUR\PERMIS DE SEJOUR\xpatspets_fichiers
C:\Users\JACKENHAUSEN\Documents\W. shared\SharePoint\T\Documents partagés\05 Expat Welcome Desk\INSCRIPTION & SEJOUR\PERMIS DE SEJOUR\xpatsresidence_fichiers
C:\Users\JACKENHAUSEN\Documents\W. shared\SharePoint\T\Documents partagés\05 Expat Welcome Desk\INSCRIPTION & SEJOUR\PERMIS DE SEJOUR\xpatspets_fichiers\Guide_fichiers
C:\Users\JACKENHAUSEN\Documents\W. shared\SharePoint\T\Documents partagés\05 Expat Welcome Desk\INSCRIPTION & SEJOUR\PERMIS DE SEJOUR\xpatspets_fichiers\RefBar_fichiers
C:\Users\JACKENHAUSEN\Documents\W. shared\SharePoint\T\Documents partagés\05 Expat Welcome Desk\INSCRIPTION & SEJOUR\PERMIS DE SEJOUR\xpatsresidence_fichiers\Guide_fichiers
C:\Users\JACKENHAUSEN\Documents\W. shared\SharePoint\T\Documents partagés\05 Expat Welcome Desk\INSCRIPTION & SEJOUR\PERMIS DE SEJOUR\xpatsresidence_fichiers\RefBar_fichiers
However, sine sync issue can also be caused by the corrupted cache, please try with the cache removal Fix it tool provided in this KB article to see if there is any improvement.
https://support.microsoft.com/en-us/kb/3038627
Note: Back up all the local documents & files to another place
before clearing cache to avoid any loss.
Thanks,
Frank