are sorted when you do a search by author or title?  They don't seem to be in ISBN order, or published date order (although that seems the closest).  I do a search by author (the one on the left where you put a name in the author box) and hit enter.  I can't see any rhyme nor reason to the results.  Same thing with title.  It has me curious to know if there is an order, and if anyone knows what it is.

You can control the sort order in the Book Browser, which is what I think you may be using.  There is a field further down to sort by date, title, etc.  I agree, I've seen no detectable order when I do a search like that, by author or part of a title.

I usually search, say "Gaaahh, did it again!!"  Then I go add a sort order, and Update Results.