In the Opencart admin area I have four categories (A B C D) and 20 products (1-20). I first created the categories and checked the Top box under data so that they would show up on the home page. I then created the products, 1-16 under category A, 17-18 under B, 19 under C, and 20 under D. However when I visit my store front, there are no products under C or D, and product 18 is missing from category B. Products 1-17 are all showing up where they should be.
I have SEO urls turned off, so this is not the root of the issue. The meta tag for all categories and products is set to "random" as I am still setting everything up.
Where should I begin troubleshooting in order to solve this issue? I tried adding some more products, and though I have added them to categories they still won't show up.