Multiple Products in cart error

[WineStack]

Hi,

 

I have set up a website located here: http://www.winestack.com.au

 

I am setting up my products to sell at a minimum of 6. It is wine that is sold in either a six pack or 12 pack.

 

My issue is that whenever I add product to the cart it comes up with an error that you must add 6 minimum quantity, and it then doesn't add the selection to the shopping cart.

 

This is from either the home page where I have a specials module, or from within the product list.

 

When I am on the actual product page itself, the order goes into the shopping cart and reads correctly.

 

Interestingly, when I reduce the minimum number to 1 bottle, it adds to the shopping cart without hesitation.

 

I have attached a couple of images for your consideration.

 

Prestashop v1.4.4.1

 

Thanks,

Mark