Cheers. Yes, I have this theme component installed. I will try disabling/enabling components as you suggest and see if I can isolate the problem
EDIT: I disabled each of the Components in the theme - then I disabled all of them except for the Tag Banners component - but nothing changed with the font size. When you reach that page, you see that the large text does show, but almost immediately, the CSS kicks in a reduces it to that size