Has anyone else been seeing duplicate registrations with the same paypal id? I'm thinking they might be reloading the final page somehow. I'm getting about 1 in 10 registrations that generate a duplicate. The dt registration id is different but the paypal id is the same. We only get our money once also.
This was already addressed. Please download the package from My Orders and update your install. If you are already using 2.6.2b, then you can just replace the file: /components/com_dtregister/dtregister.php
This will stop the problem from happening again. If you still get emails from the old transaction, you'll need to go through paypal and stop that IPN notification from resending.