You were right. I didn't have the "Metadata management" set to automatic on the "Sending books to devices". I try it and voilà the contents of my collections was changed again (lot of work to do now!). That setting is described as : on send:Calibre updates metadata and adds/removes collections for a book only when it is sent to the device. So I presumed the same thing about the collections with automatic management option. And so it does : update_device_database_collections - category='xx' books=41
I should have add (and that's why I supposed I have this problem) that the series names in my Calibre are not all the same as the categories names of my Kobo
As about the debug log: it contains more information about the contents of my Kobo then I 'm ready to go public.
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