Paid members being subscribed to Free as well, and are logged into free

On the new updated Membership plugin, people who are subscribing to a piad membership are also being added to the Free level. When they log back in they are logged in as free users, and therfore NOT seeing the material they should see as a paid user.

We are having to manually remove them from the FREE account.

Any idea why the system is doing this? It didn't happen before the upgrade.