It has been a while since I’ve actually tried to find something for myself, so it took me a while to realize: Those sets of result do show different games for me. Up until now I just assumed the default order was kind of randomized, because both the exclusion filter you linked and the default display of games display “311,173 results”.
… I take it that number is capped at 311,173 to show some mercy to the servers and that itch.io hosts more than 311,173 games then? ;) x)
Thank you for your help, FrostWorks! This has been both educational and fun for me. :)