Posts not being directed to Page using catagories

Hi, sometimes it works, sometimes it doesn’t, but lately it has not been working at all.
My menu bar has several “pages” that are all categorized. When I create a post and select the category/page that I would like for it to appear in, it does not appear in the page/section I have selected. Why aren’t my posts being sent to the pages that I select?
Thank you!

The page I need help with: [log in to see the link]