Hello @rich_miller86,
While we have checked the gallery image lightbox with the latest version of Photo Perfect theme, the inbuilt Gallery Lightbox is working correctly on our side.
Also, while inspecting your website URL, the custom lightbox seems to have been used for the popup currently.
Please make sure to have set the “Link to” attribute to the “Media File” while creating new galleries on your website and check to see if the lightbox is working.
If you have any issues further, please feel free to write back to us.
Best Regards !!