I'm going a bit crazy here. I'm using a custom theme and everything works fine; however the font for the post is set to 'Arial Unicode MS'; font-size: x-small;' even though it's nowhere on my theme CSS.
After using Firebug, I noticed that the style is being hard-coded onto the HTML, so it's not coming from the CSS:
http://s3.amazonaws.com/ember/kILAMboRdjZqfte2AMtB3olmkpq7AipL_o.png
When I select another theme, the font is still the same, it's like it's hard-coded in a file and I swear I have not messed with anything but the CSS.
You can see the site here: