cashback on discounted price

Good evening, i am using this plugin and i have this problem.
Depending on the type of user, a discount on the product is calculated.
The cashback calculated and entered in the wallet is correct while the one shown in the list of products and in detail is incorrect.

Example shown on the linked page:
Product price 89 €
Discounted price 80.10 €
Cashback (10%) shown 8.90 € (incorrect)
Cashback (10%) calculated in the wallet 8.01 € (correct)

The page I need help with: [log in to see the link]