Gallery light box images too small

Site URL: http://www.oxbowphoto.com

Hi all,

I was wondering if anyone could provide any suggestions for changing the size of images opened from a gallery into a lightbox. For some reason, when I click on images in a gallery on This page for example (scroll to the very bottom) they open in a lightbox and are far too small, and are not centered on the screen, even though the images are uploaded at the recommended 2500px . Does anyone know of a workaround in CSS or otherwise for this? Thanks so much for the help

Nevermind - I located a piece of CSS code that was causing this issue. I have resolved the issue. Thanks all. 

.sqs-gallery-design-stacked {max-height:400px;}