Not sure what's going on but I'm getting a fatal error at the bottom of the checkout page? If you want access I can make an account to check it out.
http://50.87.153.17/~twistby/?post_type=product
This is the error.
Fatal error: Call to undefined method WC_Shipping::get_available_shipping_methods() in /home/twistby/public_html/wp-content/themes/cobra/woocommerce/checkout/review-order.php on line 14