Subscriber Attributes showing when not on subscribe page but on update

running 3.2.5

I have a subscriber attribute “admin only” and it is not listed on any subscribe page.
However, it is now showing when a user clicks the footer to update their online preferences.

How can I make sure that this attribute never shows to the public… I use it for notes about an individual concerning info I have learned over the course of time and the info within must remain private to only Admins.

At this point I have had to remove the update preference from the footer.