Not expecting anyone to provide a solution. As I have not accepted any answer as the solution to a majority of questions I posted in this community.
Basically, I received emergency alerts on my phone like Amber alerts or extreme weather alerts; however, the last time I received such notice, one of the notification fails to disappear completely after numerous attempt of me indicating to my phone that I already received and read the notice and the alert is no longer relevant and outdated. I have not done a factory reset.
Perhaps if another emergency alert is sent out then the unwanted display will disappear when I clear the new emergency alert.
My opinion about the default emergency alert can be a long thread on its own so I'll keep it to myself.