Posts Not Showing Up On Pages

Hello, We have successfully created 7 posts. Six of them show up on the Outfits page as that is the Category selected for them. A 7th post "7) A Wack-A-Doodle Mystery Installment 1" was set for a different category (page), Musings & Mystery, but it doesn't show up on that page. We then selected all the other Categories (pages) including the Outfits page and applied it to the 7th post to see if the 7th post would appear on those pages. It did show up on the Outfits page with the previous 6 posts, but it will not show up on any of the other pages. We removed it from the Outfits page since it doesn't belong there, it was only posted there as a test. Is there some setting that's preventing this post from appearing on any other pages even though the correct category is selected in the Posts editing section? This all pertains to the website we previously posted questions about in the forum.