No posts show under Category URL

In addition to classified car listings at https://mustangtraderonline.com, we have articles written under normal WordPress Posts. These posts are divided into categories. One such category is called ‘Mustang Articles’ and the URL for this is at https://mustangtraderonline.com/category/mustang-articles/ but when you try to navigate to that URL it redirects you to our Home Page (there is nothing in htaccess to cause this). Yet when you look in the WordPress Admin under Posts/Categories it clearly shows 17 articles/posts in that category and uses that URL. And the 17 posts, if you edit them, show the category of ‘Mustang Articles’. And if you click on ‘view link’ in each post, it DOES bring up the article. So my question is why don’t they show up under the URL for the category.