Market Press Lite - Shopping cart issue

Hi All,

I'm having a issue with the shopping cart. All was working fine, but now when a product is added to the cart, it adds in the left hand menu cart preview (and if there was a item already added from a previous session, it will add on top of that, though it will initially show nothing in the cart), but when you go the shopping cart page, it does not show. Also two other products seem to default be added to every shopping cart (on the shopping cart page only - tested on multiple computers)

Any help would be huge!