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You are telling it to do conflicting (multiple) sorts.
You have differing Authors, Differing Titles.
Series [index] ONLY relevant sort if you want series order
The only time you can (want to?) do 'Bias' (the prior sort) is when the INDEX is the same
Then a single (title or Author) prior (bias) sort is relevant.
Only when the author is IDENTICAL, and the series[index] are the same can you sort on Author (kind of redundant), then title, then Series
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