Product page lightbox pop-up not showing thumbnail

Hi everyone,

I am having issues on my product page. When I click the "buy now" button a lightbox pop-up where i have images and form fields. The image is not showing. Please check the url and ss attached.

https://www.motherandchild.com.sg/courses/first-aid-for-couples-course

Thanks in advance! 

Can you share link to list page?