Let me be clear. I simply CANNOT isolated this issue to one or 2 specific products or categories. I might put 25 products into one of my preferred categories and NONE of them show up on the menus! SO, there is not one single product or category that is a problem! It might be dozens of products or several categories.
I have tried duplicating how one set of products is working to others and nothing works. So, that is my confusion/frustration. I am not stupid, I have been working with computers and languages for nearly 50 years, so I understand logic. There is little to no documentation on how categories work in Prestashop so it is all trial and error.