I don't think there is any guarentee that ADE biases (retains) the previous sort order like Calibre does.
You sort on author, you get books clumped by author.
Personally, I don't Read books on my PC (let alone with ADE).
My device only use the file system, wher I have folders for Series and sort on filename
h_Series/Hollows(Rachael Morgan)/11-Ever After-Kim Harrison
So don't get Tinks panties in a bunch