It appears the profile page is not placing the content within the correct boundaries. The whole left side is off a few pixels. I don't know if it's just the contents completely shifted to the left (I notice a big gap on the right between the horizontal dividers and the right boundary) or the gap really belongs on both sides.
It only appears here on Gaming (the main site and meta) and doesn't appear on other sites so I think there's some bugs in the site's CSS files.
It is like this on both FF8 and IE9 on Win7x64.