Does anyone know anything about Woocommerce?

If so i'm having issues. http://cardiaclife.org/
If I use the shortcode
[featured_products per_page="16" columns="4" orderby="date" order="desc"]
no matter what I put it never changes the columns. I want it to be 4 but it just stays 3 and I can't find a solution to this problem anywhere.
Thanks,
Brian