What's up with my fonts?? HELP!!

Only on certain sites, and from both safari and firefox, I have these corrupt fonts. This isn't even a real language (at least, none that I know of)!! It's most annoying on my itunes (as demonstrated in my screen captures). I've gone into my preferences and changed the fonts, but it hasn't helped. What the heck is wrong, and what do I do to fix it?? Please, and thank you