Why doe s the lightbox not work on gallery images but works on featured image

Lightboxes not working on gallery images, still works on featured images. This worked fine until Wordpress was updated

When gallery images are clicked on it goes directly to http://www.sugdenanddaughters.co.uk/vintage/?attachment_id=792

from http://www.sugdenanddaughters.co.uk/vintage/store/products/french-glass-pendant-light-shade/

I have installed various plugins and can not get any to work on gallery images

your help would be appreciated

thanks

Louisa