I am having a problem that I also see on your demo. After upgrading to 3.0, my ADD TO CART buttons and product options are not showing on mobile phones. I checked on both Android and iPhone. Works fine on iPad. My site is behaving just like your demo. On product page below the photos there is a blank white space where the product info and button should be. I have the same website at two different locations because we just relocated the website. Where we have theme 2.92 everything works fine, but the same site with 3.0 isn’t working.
I found your fix on another post and that fixed the issue for me. Your support has ALWAYS been the best.
/** Temporary Fix for Product Summary being Hidden on Mobile **/
Add this to your Quick CSS in the Theme Options>General Styling:
@media only screen and (max-width: 767px) { .single-product-summary { overflow: visible; } }