I don’t see option to add to cart for your products http://prntscr.com/socto6
Could you, please, test if your issue appears when the default Storefront theme is enabled (go to Appearance > Themes > install and activate Storefront and check)? In case your problem appears with Legenda theme only then please, provide us with temporary WP Dashboard and FTP access to your site, and screenshots of the issue for better understanding.
