Loyalty module bad function

[Zetaboo]

We have configured the module loyalty and we want that coupons can be used only in a section of the site with 20 specific products, we've created called "Redeem your points." The problem is that, even though that section only is checked to use the discount, the customer can use the discount throughout the store and not just in that section. Only we want the client to use the discount on that one section of "Redeem Your Points"

Anybody can help me? We work with PS 1.5.3 Thanks.