I did some research before posting this, and while I found some things on certain categories not showing up I didn't find anyone with my specific problem. If this topic already existed please direct me there and delete or close this thread.
I had about 20 or so different categories... one of them had about 184 posts ... I decided to merge them all into one category (I renamed it "General") and that's the default one, so I deleted everything and all posts successfully merged into the default category, and I can see all posts if I go here:
However, if you go to the main page:
Under "Topics," there's only Announcements with one single post, and the default category, which is "General," won't show.