Shopping cart busted?

Mouser

I clicked on the 'i13 100 Essential Expressions for Michael 6' add to cart button but the cart still shows zero items.
Clicked again and get cannot order more than 1?
So I open the cart, there are no items?
Logged out & logged back in without change, I cant add the item as the cart thinks its already there.
So I try to purchase it but it says there is nothing in the cart.
So I go and try and add it again and I'm back where I started, only one per customer message.

Can someone fix Daz's busted cart/store?

fixmypcmike

After logging out and back in, add a different item to the cart,, and everything should now show in the cart, then delete the extra item.

Mouser

Fixed after added an extra item as advised.