Comments & Comments form broken in IE, FF

For some reason comments appear in the left column at times and the comment submission form spans across the entire page. In FF there is a huge gap between the page content and the comments.

Broken (Blog Comments; see the bottom of the left column for comments (!!); Comment form spans entire page)
http://www.nextgenthinktank.com/node/2#comment-4

Broken (Blog Comments; they are present under the page content, but the form is all messed up)
http://www.nextgenthinktank.com/node/8

Working (Poll Comments)
http://www.nextgenthinktank.com/node/6#comment-6