Apparently bbPress doesn’t recognize or work out the latest post (freshness tweak) when you have:

category -> category -> forum -> topic

Unless…there is a reply attached to that topic, then the latest post/topic will show up.

[@robkk Moderator 8 years, 6 months ago]

What freshness tweak are you talking about? If it is from a plugin, contact the plugin author on their respective support forums.