Membership Plugin: New Site Creation wp-signup.php Redirect Problem

Hello. I'm having an issue with the Membership plugin on a multisite setup. I have set up a subscription plan that gives users blog creation ability. However, when users with this subscription attempt to create a blog via the Wordpress Admin (My Sites > Create a New Site), Wordpress tries to take them to, which is redirected to (the Membership plugin's subscription registration page).

At that point, if the user clicks on "Sign Up" for the subscription plan, a message displays, telling them that they already have that subscription, and gives options for switching to a different subscription. So, they never are able to reach a page that allows them to create a blog. It seems that the Membership plugin is causing this redirect to happen.

Any idea why this redirect is happening, and how I can get blog creation to work?

Thanks in advance for your help!