Woocommerce Attribute Problem

Hi,

I am using vantage theme and woocommerce.

When I try to purchase variable products, the product pages show attributes.
But when I go to cart page, all attribute info will be gone.

I updated theme and all plugin, but it is still not functioning.
http://gotwos.com/product/kaigai-marketing/

Any thought to solve this issue?

Thanks in advance,

Kazuki