Right,
I thought you mean the campaign tags, my bad.
If you take a look at that url in the email, you will see it actually points to lists/subscribe-confirm url and in case you have confirmed your account earlier, you will be redirected to the update profile page like you do, which is fine.
So, to recap, first time you are redirected to a confirmation page that says thanks for subscription, then next click on same link will get you the update profile page since you are already subscribed so there's nothing to confirm.
Hope it makes sense.
Thanks.