Comment 5 for bug 1483666

Unless I misunderstand what the 'catalog' is, then I too have this problem - and I will report it (despite comment #4) because Calibre itself is maintained and this seems like a serious bug.

Here is one instance of an alleged alphabetical sort by author name:
https://i.postimg.cc/2yF0P10G/image.png

Here is another, after I clicked the small arrow (to reverse sort direction, I take it):
https://i.postimg.cc/28tWCzg7/image.png

Even allowing for problems caused by some author fields having first names and others lacking them, I cannot discern the principle upon which the program is sorting.