I have version 2.9.1 and I am having a similar problem. It processes the payment fine, but it only lists the donation as a one-time payment. I got a call from a donor who experienced it, then I did it myself and got the same results. I will send you a PM with login info.
For someone who has similar issue, it was a bug in the extension and was fixed about 2 or 3 weeks ago. So if you have this issue, simply login to your account, access to My Downloads menu item, see the order, download it and upgrade to your site. After that, the issue will be solved.