Just had a play. By replacing all of her percentage and em font sizes with px (120% and 1.2em changed to 14px) - the fontsize stays the same all the way down the page.
It's obviously not good using px, as the user can't increase font-size, but there's probably something up (unclosed tags or something) that's causing it.
EM is (afaik) worked out from it's parent object. And so on. So lots of 1.2ems in each other will make the final object very big indeed
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