I’ve noticed that multiple citations in footnotes are randomly ordered in Chicago Manual of Style 17 (note) rather than alphabetically as the style requires (according to Chicago Manual of Style 17: ‘When including multiple authors in a footnote you should order them alphabetically according to the first author’s surname’). I’ve noticed that one or two other citation styles have this problem with multiple citations too - although APA and Oxford do work well, and order multiple citations alphabetically. Here is an example of the problem using one of my footnotes, first in APA:
And then in Chicago:
All the best and sorry for another query.