Cant add 2 different products to my cart

[upcloseweddings]

I used google sites to build my website (www.upcloseweddings.com) and am paying $5 for the shopify starter.  I've embedded 3 different products (services) to my website.  When I try to add 2 different products to the cart it deletes the previous product added (showing only 1 product in the cart).  When I go directly to the shopify (https://qx0rbq-mc.myshopify.com/) this isnt an issue only on my google website.