Comments show as bug

When I leave comments in Japanease it show as unreadable characters.

Please see attached image.

I have not tested other than English and Japanese.
I think same problem happens if you leave comments with 2bits charactar.(e.g. chinese, korean, etc.)

Dose any one know how to solve this problem, please give me adivec.

Thanks,

Works fine on demo.boonex.com.

Try it there, so we know it's not your browser.