No, it is not sorting by series index, it is sorting by Title, alphabetically. On both my PRS 650 and PRS-600.
So a have the column disporder (titled Author). I did a author series in that column. Say David Baldacci. Under his name, I assign each book a series number, 1 - 10. I upload the books to the reader, and I get a collection titled "David Baldacci (Author)". But when I open this collection, the books are ordered alphabetically by title, NOT by the series number.
In my case, I have a second column called genre (title Genre). If I make a genre SciFi and order the books in that group in some order, again, I get a collection called, "ScFi (Genre)" but the books are ordered alphabetically.
BTW I am NOT created collections based on the Author(s) column that is standard for Calibre, as it ends up making separate collections for second and third authors.
But for collections series created based on the Series column, they are correctly sorted by series number.
So it is treating collections created from Series differently than the collections created from user defined columns that are series like (have a series number).
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