Images oddly thin when opening them

Hey all,

Got a strange problem.

I have a site for art, using NGGallery, but when opening the images, they’re oddly thin or long. The image is warped and it doesn’t look as intended.

http://www.sallyanndavies.com/gallery/current-works/

Any help appreciated.

Thanks,
Chad

https://wordpress.org/plugins/nextgen-gallery/