Hello,

I have deactivated all the plugins and switched to the parent theme and everything works https://gyazo.com/f3641bec566cf28db596e3c979e82048

Do the same, and activate one by one to detect which plugin causes the problem.

Please add this code to the Theme Settings > Custom CSS > Global:

body .popup-quick-view .entry-summary .product_meta > .sku_wrapper {
display:none;
}

Best Regards