Discount coupons in the cart, but not in Paypal

[lucapac]

Hi,
I've a problem whit my site in J 3.4.1 + VM 3.0.8

If I apply a discount coupon to the total, the cart is updated correctly, but when I get redirected to PayPal, the total amount payable does not include the discount.

Somebody can help me please?

Thank yout.
Maggie.