Hi,
The screenshot you're giving for the page without the add to cart button is a product page, but the screenshots of the settings are from listing pages.
For the display of the add to cart button on the product pages, you need to check the setting "Display 'Add to cart' button" of the HikaShop configuration.
Also, if you activated the "catalogue mode" setting of the HikaShop configuration, that would remove the add to cart buttons everywhere on your shop.
PS: I couldn't find the page you're talking about on your frontend. It would be great that you provide a direct link to the page where you have the isssue and not just the link to the homepage of your website when you send a question in. That way, we can reproduce the issue and better understand what's going on and thus better and faster help you.