Gallery shortcode column issues

I am using gallery shortcode with WP 3.0 and the Suffusion theme and for some reason, I cannot get it to give me three columns. I have tried for two hours and so far nothing seems to work. http://www.estiphoto.com

I am trying to use it on a photography website. I have a static home page with this code [gallery columns="3"] and yet, it keeps breaking up and giving me two columns.

I have tried using Firebug, but I can’t seem to find any problems with the margin and padding settings. I have used gallery shortcode in several WP 2.9 sites and never encountered this problem.

Thanks,

WiLd