Hello, @Fernez,
Actually, The issue appeared because in the products you have set the “Sold Individually” see the image:https://postimg.cc/Yvn6GL2W that’s why the quantity button doesn’t appear I just uncheck this so now users are able to purchase items more than 1 item and the button start appear on the site see the image: https://postimg.cc/pyrprchq now please check back to the site after clearing the browser cache. Here is the URL of the product that you shared with us: https://eyok.happywebby.com/product/google-nest-hello-smart-wi-fi-video-doorbell/
Regards 8Themes Team.