why is my font on iChat way bigger than ...

I was talking to one of my friends and I thought that my font was set to 10 like it always is but its really at like 14. I don't know how this happened but it looks normal to me on iChat but on any other program (I tested it out on meebo) it's way too big. I tried just setting my font at 10, then 9. But nothing happened.

How do I fix it?

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