Thank you for your quick reply.
This happens on http://www.ramdam-dlx.com
When you add a “NEW”-labeled hand fan (you can try with “No Drama” for example), there is a 4,95€ discount that automatically applies to the order (the discount is initially activated if you add at least one “NEW” hand fan to your order).
Going backwards, if you then remove every “NEW”-labeled hand fan but leave other products (for example, pins) in the cart, you’ll notice that the coupon does not go away.