Admin permissions access error

Believe we have found a bug.

Under Membership > All Members
The landing page pulls fine. The path displayed is /admin.php?page=membershipmembers

Clicking page 2 displays "You do not have sufficient permissions to access this page." The path is /admin.php?page=members&userspage=2

Changing this link manually to /admin.php?page=membershipmembers&userspage=2 pulls correctly.

Any thoughts on this error appreciated.