Product Image Not displaying in the main image section

I am having an issue with the website that I have created. THis is opencart version 2.0.1.1.
When clicked on the additional image thumbnail of a product, instead of displaying it in the main image area, it opens up as a link(screenshot attached)
This is the link to one of the product pages:https://www.sd-dev.sofasdirect.com.au/c ... ffee-table
Not sure how to fix the issue. Can this be fixed?

The theme support swap image?

If not try an extension from here
https://www.opencart.com/index.php?rout ... n_id=10817

Thanks. It worked.