Yoast SEO does not see images on page edited with Theme?

Even though my page has lots of images, your tool says that I do not have any?

I am using the Enfold theme.

The page is:

http://droylsdenglass.co.uk/barge-boards/

And here is the SEO yoast tool display:

https://goo.gl/photos/4r5H1CkLaANcUE2UA

Would be good if this could be sorted out.

https://wordpress.org/plugins/wordpress-seo/