Ok just to be clear. You created a blogpage, and included a certain category on it. In that category is one post called “Testimonials”. I think the reason why the comments don’t work is because the page and post have the same name. So when you click on “Comments”, the browser thinks you’re aleady on the correct page, while in fact you aren’t. I take it you want all testimonials in that one post right? Try deleting the blogpage and including a direct link to the testimonials post in the navigation menu. Don’t forget to also delete the blogpage from the trash or it won’t work. I can’t be sure since I’m not logged into your admin, but it should work. Let me know if this works!