Different margin/spacing from index page to post page

Hey guys,
although I’ve always managed to get around all the strange errors coding has generated me, I can’t get past this one.

WordPress is rendering different margins/line spacings/paddings, when I compare the homepage of my blog to a postpage. I’ve reduced CSS to minimum (body bg and font color), so I know it’s not CSS…

I wonder what could be causing this.
The two mentioned URL are:
http://holokinesis.net/blog/
http://holokinesis.net/blog/2008/10/24/welcome-all/