Why is this happening? I'm using Windows 7 32bit with the latest stable Chrome build.
This site displays correctly on Firefox, so I think that your problem is font corruption in Chrome or in Windows.
A look in the site's css file shows this line :
As the fonts are tried by order, and as I don't think that the second entry of Helvetica can be corrupted without you noticing it, then you might have a bad font named "Helvetica Neue". Try to search for it in Control Panel -> Fonts.
Otherwise, I would suggest to completely uninstall Chrome using Revo Uninstaller Freeware, ensuring that all its directories were deleted, then reinstalling.
Click the Wrench icon, then go to Tools > Encoding. Try changing the encoding and see if that works.