Single product page gallery active image is not loading on ios mobile safari

Hi there,

We are using woocommerce on our site and the gallery light box on product single page is working fine across all the browsers except ios safari. When we visit some of the product pages its displaying main image fine but for some other products, its not loading the image.

Could you please see what could be the reason?

The page I need help with: [log in to see the link]