Okay, So I have activated the Wizio Bundle app on my shopify.
When I make a quantity bundle with discount in % and add the product to my shopping cart, I can't see the discounted price on my shopping cart page. When I click on checkout, only then I can see the correct discounted price.
Also, the discounted price, is setted up as a discount code on my checkoutpage. I can't fill in another discount code together with my bundle app.