Adding 3 lots of the same item to shopping cart causes a problem
When I add 3 lots of the same item to shopping cart the first 2 are okay and it just adds them together. But when I add a third of the same item it creates it on a new line as if it is a different product. This error doesn't happen if I change the quantity in the shopping cart and click the update button.
I just checked another website for the same problem and it has the same issue.