PayPal made transaction but show Payment error

[andreana]

Hello,

I have a problem with PayPal module.

I tested the payments and it seems to work well until it is redirected back to the site and give me to confirm order. I confirm my order and then give me this message:

Payment error
Please try to contact the merchant:
An error occurred while processing payment

And next is total of the transaction which is not the correct sum.

My order was for 4 BGN. PayPal exchange it in 2 euro. When redirect me it showed 4 BGN but when give me Payment error it shows 2 BGN.

At the same time the transaction is completed correctly. The money is transferred from my bank account to business bank account and the sum is correct.

PayPal send message Receipt for Your Payment but the Prestashop send message Payment error.

Please, help me to fix it.