>why are three books in front of me in the Perl category about Swift, HTML, and PHP? This is a big problem for more than just niche books. When I tried to fin

>why are three books in front of me in the Perl category about Swift, HTML, and PHP? This is a big problem for more than just niche books. When I tried to find a new fiction book by browsing categories I found the same books listed in every major category, i.e. it's difficult to believe the same book ought to be listed in Sci fi, horror, self help, history, and current events.