Simple div columns question

My website (badoh.com) validates fine and it looks alright on firefox, safari, ie7 and firefox for linux but my friend emailed me this screenshot

and it looks really messed up.

Can anyone confirm the columns do this? I can't replicate the problem on my end, so it's a bit frustrating.

 

I just loaded your site in Firefox on a Mac and it looks identical to the screenshot except there is no Firefox image.

 

Same here in FF under windows and in Opera. Looks just like the image.

I was going to give you a code breakdown on what I saw wrong, then I saw this:
<meta name="generator" content="WordPress 2.6.2" />

So I'm just going to walk away before I rant, rave and get myself banned... though a good start would be to fix this:
http://validator.w3.org/check?uri=h...(detect+automatically)&doctype=Inline&group=0

 

in my firefox in mac the html css is the same

 

Alright, I fixed the html errors and made a couple additional tweaks.

Can anyone confirm the columns are still breaking?

 

It looks fine to me in FF3 and IE7 windows.

Although I would like to read DS rant and rave about Wordpress!