If you use some program and sort books on author, and only on author, groups of books with the same author may then come in any order. Perhaps seemingly random or influenced by a previous sort on some other field. This differs between different programs, and depends mainly on how the sort algorithm was implemented.
In some programs, like Calibre, sorting is stable. That means that you can first sort all books on title, and then on author. You will then find that the books for each author are sorted by title.
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