This product style is different. You enabled Compact Style (check your screenshot). Compact style is made to be compact, so, no place for button. This product layout style is for Price comparison sites and directory sites, so it must be without button. Enable Regular style.
Also, if you need deal/coupon site, you don't need filters, specifications and price comparison, it's better to use Regular Posts (deal grid in posts have option to enable buttons). Also, we recommend to enable Recash child theme for deal sites