When I click on 'Add to Cart' I receive the following error

When I click on 'Add to Cart' I receive the following error message:

There are no items in your cart - go add some !

If I click on the product itself and 'Add to Cart' I get the same message.

If I change the quantity around, then 'Add to Cart' it works. Shouldn't I just be able to click add to cart, even if the quantity one is all I want? Support Access is granted.

Thanks!
Cameron