I've seen it before. Some Web sites will list multiple fonts that CAN be used for that text if the machine has it on the computer. So for example, If I say that my headers can be rendered with Arial, Helvetica, and Verdana, the browser will render it with Helvetic first IF Arial is not on the system. If the list is backwards (Helvetica, Arial, Verdana) and you have some sort of Helvetica font on your machine (which it looks like you do), even if it's an obscure one in the font family, It'll render it.
How to fix it? remove the font. I think it's a Windows 7 thing, TBH. I had the problem once in Windows 7 but NEVER had it in XP.