Hi
I've not changed my Calibre setup for months; maybe even years. I'm using a plugboard which reformats the author's name, and puts the series in there too. This is the data in Calibre:
Author: Lastname, Firstname
Author_Sort: Lastname, Firstname
Series: Great Series [1]
The plugboard removes the comma and space from the Authors field, replacing it with an underscore. (If you don't, the Kindle will sort by last name, but will display Firstname Lastname, which I find very irritating.)
During sideloading, the author field will become this:
Lastname_Firstname (Great Series 01)
This works as intended, and shows up correctly on the Kindle home screen, but strangely enough, the Kindle is sorting backwards. The last book in the series is at the top, instead of at the bottom.
What could be the cause of this? I don't know when this started, as I have not been reading series for a while.