The All-Star badge is given to top contributors of the Zillow community. These are active Zillow users who share their real estate knowledge and help others by contributing high-quality content. The more and better the contributions, the more likely an award will be granted. Users' contributions can be seen in their profiles.
The problem may be another zilllow account linked to the same Email adress, same happened to me, just check to make sure. You could also use another email adress and use that email adress as the alternative email to get updates.