Auto Assign Membership Permissions

Hi

If I use the membership plugin and move a user from Group A (Author Role linked to it) to Group B (Editor Role linked to it) they automatically get all Membership Permissions assigned. I do not want this as I only want these to be controlled by Admins.

I know I can manually go into a member afterwards and remove all the Membership permissions but my question is how do I set what each role should get to prevent this from happening?

Thanks

Wayne