WooCommerce Product Variation Options Aren't Yet Appearing

I’ve followed the Woothemes documentation tutorial for Variable Products, have set up a global attribute, and have entered a few variations of a product with specific attribute values.

When I go to the site’s Shop Page I see the attribute, as well as the “Choose an option” dropdown list, but when I click on the dropdown list I don’t see any of the attribute values.

What’s strange is that, under the site’s product page, there’s a tab called “Additional Information”, and when I click on this tab I see the attribute values listed there.

I’m not wanting the attribute values to show up under “Additional Information”, but want them to show up in the “Choose an option” dropdown list.

Can someone help me out?

You can see the Product Page
here.