[Theme Mystile] Theme is not browsersafe

I have notised that my checkout dont work and the logotype is wrong size when i use IE 6-10 Chrome and firefox works fine.
Any quick fix or download/buy new theme?

Is there any theme 100% working with woocommerce all browsers?

Its a free theme and not supported by the woo guys.

m.

http://wordpress.org/extend/plugins/woocommerce/