Why is google the best search engine, or is it just my site?

Not sure I follow what's happening on that one section. Is it that it shows up fine in Bing or DuckDuckGo but not in Google, or the other way round? If it's only one section, it's almost never the search engine. Check that section's pages with URL inspection in Search Console and look for a noindex, a canonical pointing somewhere else, or a robots.txt rule blocking that folder. Those three cover most cases.