Page loading that was never created!

My Website is: http://www.oldbarnrescue.com/wallgraphics

My problem is within my “Shop” section of the website. I have 8 different categories that I plan to insert text and images along with some E-Junkie code so users can purchase my products. When I use the “drop-down” menu that came with my theme (SimpleX) and click on “Beach & Cabin”, “Bedroom”, “Car”, “Kitchen & Entry”, or “Monogram” the correct page loads BUT when I click on “Children”, “Graphics”, or “Inspirational” the wrong page loads! I actually deleted the “Children”, “Graphics”, and “Inspirational” pages from my site and if you navigated to http://www.oldbarnrescue.come/wallgraphics/shop/children (or any of the other pages) the same page loads that was loading when the pages were no deleted!