Problem with payment confermation

Hi Ginger, sorry to bother you again, but I’m having a problem after removing the test payment. The payment is received, but the donor still sees it as being processed. This didn’t happen with the test feature; they would receive a processing email first, followed by confirmation. Furthermore, if I enter the correct credit card number but then enter an incorrect expiration date, the payment obviously isn’t processed, but I see it’s being processed in my plugin admin dashboard, and the donor also receives payment processing emails.
The site is always https://ailmodena.org/dona-ora-per-ail-modena/
Greets

Silvia