Where are you looking at the books to see a different sort? On an ereader? In a directory on your local hard drive? I tried your template in Save to disk and it worked on my Windows 11 computer.
I did modify it by adding a couple of sublist items to only use the first entry in the author_sort or authors list.
Code:
{author_sort:sublist(0,1,&)}/{authors:sublist(0,1,&)} - {title}
My normal save to disk template is:
Code:
{author_sort:sublist(0,1,&)}/{series:|[|} {series_index:0>2s||] - }{title} - {authors:sublist(0,1,&)}