[Typo3-shop] empty the ammounts/bananaShop

[Eric Vlemmings]

I've built a shop.

I've got 5 items on 1 screen, when someone buys 1 or 2 products and push on 
order they automatically go to the shopping basket.

When they forgot something they can go back to the products list, my problem 
is that the amount isn't empty. So when they press again on order, the order 
automatically doubles?

When I look at the bananaShop http://www.fholzinger.com/index.php?id=35 it 
doesn't???

What am I doing differently

Thanks in advance,