Different css on different blog posts?!

Hey WordPress fans and alike!

I’ve run into a problem with my blog. When I published my last post, the css for the comments form (or perhaps the html?) is different than for all my other posts. It’s not in a particular category which calls for this, so I think that the behaviour is highly strange.

Here’s the new blog post which doesn’t look like it should:
http://www.justkeepthechange.com/how-to-use-your-poker-skills-to-get-popular-with-women
And also, one can’t comment on it. So not only does it look different than the other’s, it also doesn’t function. And the sidebar falls down below the post instead of staying to the right…

Here is a link to a perfectly functioning blog post:
http://www.justkeepthechange.com/how-to-get-over-losing-your-first-love
Comments work, it looks great and the sidebar is at place.

What could possibly be the problem here? I really can’t figure it out. Hope you can – I would be extremely grateful.

Alex