Nextgen showing thumbs in portrait?

Hi guys. On my website at https://www.exposureme.com I have an issue in the portfolio -> People section. I have two images, both of which are horizontal, landscape photos. They are 900px wide. I uploaded them into nextgen and they used to work normally, but then I did something which affected it (i can’t remember what). Regardless of what sizes I chose in the thumbnail settings, they still do not change. The boxes stays in the same size and is in portrait.

How can I get back to normal sizing, such as 150×100 px?