Gallery not showing in grid on IE

My Next Gen Gallery looks fine on all browsers except IE 7,8,9.

The thumbnails don’t form a grid, instead they just go vertically downwards. I’ve tried a few other bits I’ve seen on the forum but nothing so far is working? Any help?

http://www.hurford-salvi-carr.co.uk/blog/brewhouse-yard-ec1v

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