You may have created a new certificate, but have you told the Firewall to use it?
The evidence provided would suggest that you have not.
If you go to the Maintenance -> Remote Access Management screen in the GUI you can then select the new certificate you have created from the drop-down list box.
What I'm not personally sure of is whether the Firewall needs to be re-booted or if the Admin Console service needs to be restarted in order for it to use the new certificate.
Philm is absolutely correct. And I can verify that a reboot of the firewall or restart of the service is not necessary.