Mobile Add to Cart Button not functioning

Hello,
I cannot get the mobile version to work. I set up the products and the options are added for variable products and the desktop functionality is working correctly, but on the mobile site, it’s not allowing you to add any items to the cart. Even if you choose your options, it keeps the “add to cart” grayed out and prompts you to choose options. It looks like javascript isn’t executing on mobile…? plugins/woocommerce/assets/js/frontend/add-to-cart-variation.min.js
I’m not seeing any odd classes in any of the code.
example:http://browndogcoffee.com/product/brown-dog-antler-chew/

https://wordpress.org/plugins/woocommerce/