@un_pogaz - the author_sort can be valid according to the algorithm used (e.g. 'invert'), but that does not mean it is correct. Examples:
If I enter "Madeleine St John" as Author then the resultant author_sort will be "John, Madeleine St" which is wrong. The correct value is "St John, Madeleine".
Similarly, "Gabriel García Márquez" will result in author_sort value of "Márquez, Gabriel García" but the correct value is "Garcia Marquez, Gabriel"
In both instances I changed the author_sort value in Manage Authors at the time the first book for those authors was being added and it has been correct ever since.
IMO the formation of sort names can never be fully automated - there will always be exceptions - and calibre allows for that, and I prefer to do it at the point of creation.
BR
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