Newsletter Subscribe / Unsubscribe Button
You will notice that the newsletter subscription block in the left column of every page changes once you log into the site. The blank for your e-mail address and the Subscribe button turn into an Unsubscribe button.
This is the designed behaviour and gives you an opportunity to opt out of the newsletter by clicking unsubscribe.
It does not mean that you are subscribed but not receiving the newsletter. You always receive the newsletter when you are subscribed.