Responsive Thumbnails?

Hello,
I use NextGEN Basic Thumbnails. In my pc looks ok but in the ipad the third thumbnail (column)goes under the firsts two.
I tried to make them smaller, it’s working, but then i have the same problem in the nexus 7.
So, i’d like to know if the thumbnails are responsive or i have to change some option.

Sample: http://bit.ly/WgztMh

thank you

http://ww.wp.xz.cn/plugins/nextgen-gallery/