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The current uc_paypal module only triggers a successful transaction when the message "Success" is returned from Paypal.
However, there is another successful transaction message of "SuccessWithWarning" that is returned when Paypal wants to simply return a warning along with the success message.
The big problem here, is that it charges the card successfully, however Ubercart reports that the transaction is unsuccessful and prompts them to try again, resulting in many duplicate charges.
This was reported earlier at http://www.ubercart.org/issue/9428/paymentuc_paypaluc_paypalmodule_simpl...