I marked @psyllidhipster’s post as a Solution because this isn’t a bug, it’s working the way it’s designed. Please make a feature request if you want a way to see a list of the observers with the most species, although if you want it to be done on the Explore page, might be best to just add it to this thread: https://forum.inaturalist.org/t/ideas-for-a-revamped-explore-observations-search-page/8439