This one gets me all the time :)
In fact, I just fixed it on my own project a few minutes ago!
Some WP themes have a line in them that prevents images from overflowing, but it messes images up when they're placed in fluid structures like tables.
Check out line 2 of
TAKE THAT S*** OUT!
heh. Or maybe just comment it out for now, in case it screws anything else up on your site. I did a quick flip through, you should be ok by just removing it.
Do you have any developer tools like Firebug or Chrome dev tools? If so, right-click on the image and inspect - you'll see the style show up in your inspector pane and can disable it real-time.