When I visit kbin.social, I see new posts regularly. On other servers posts stay on the frontpage for multiple days. This is also true if I switch their sorting to “hot”. So that is probably not the difference.
What is kbin.social doing differently?
You bet! The fediverse is definitely a confusing concept to wrap your head around the first time. And it doesn’t help that different software server instances don’t need to use a site name that specifies which software they are (like Beehaw, for example).