Since Single Sign On, the system is showing all memberships that are under your email address. This will include memberships you created some time ago, in error, no longer use, only used once and so on.
If you can see a membership in your account that you do not recognise, this is likely to be an old or unused account that was created in the past. You may also see a membership number that is associated with a Season Ticket Waiting List.
If you no longer require this account, please submit an enquiry form here and we will ensure that this account is removed from view.