USPS Shipping Price Does Not Update

Store URL: Local dev environment
WordPress version: 3.8
WP e-Commerce version: 3.8.13.3
Gold Cart version: 3.8.13.3
Theme: Mosaic

I did this: I toggle USPS shipping options under ‘Calculate Shipping Price’ on Checkout page

I expected WP e-Commerce to do this: I expected the total price and shipping price to update.

Instead it did this: Instead it did not change. The AJAX response comes back but the prices are the same. The response always returns first-class price no matter what option I choose. Detailed info below:

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There is an issue with the calculate_shipping function. admin-ajax is called with the following example POST params:

action:update_shipping_price
option:Priority Mail 1-Day^™
method:usps

Example response params:

{“shipping”:”<span class=’pricedisplay’>$2.07<\/span>”,”coupon”:”<span class=’pricedisplay’>$0.00<\/span>”,”cart_total”:”<span class=’pricedisplay’>$4.83<\/span>”,”tax”:”<span class=’pricedisplay’>$0.16<\/span>”}

I have 3 options at the moment, first-class, priority, and express. When I toggle between the options at checkout I get the same ajax response every time.

http://wordpress.org/plugins/wp-e-commerce/