Marketpress automatic payments are not extending the service

One of my client's sites finished the first billing cycle yesterday. I recieved a payment from paypal but it didn't extend the site access. The payment terms are as follows:

Pro Site privileges expired on: September 10, 2013
Previous Level: 0 -
Previous Payment Gateway: PayPal Express/Pro
Previous Payment Term: 1 Month

Payment Method: Their PayPal Account
Last Payment Date: September 10, 2013
Last Payment Amount: $45.00
Next Payment Date: October 10, 2013
Payments Made With This Subscription: 1 *
Aggregate Total With This Subscription: $60.00 *

I then recieved an email from PayPal saying that a URL is using my PayPal IPN. The URL is webvyne.com/whmcs. I had WHMCS installed on this domain previously but I have since changed hosts and have installed wordpress fresh. I don't know if this has something to do with the payment problems I am having and I don't know what to do from here. I'm afraid that a manual extension with mess things up. Please help ASAP!

Thanks,