SMF - Just Installed!
Go to Safari > Preferences > Websites and select Pop-up Windows to view your settings. As a shortcut, you can customize the Safari toolbar (via View > Customize Toolbar) to include the Website Preferences icon.I assume that you haven't done the above, but if you have, please tell us what else you have tried.
You might want to see if Monterey also has a "Notifications" item in the Websites list. That allows you to Deny or Allow sites that have 'asked' for permission to show alerts in Notification Center. I assume that "Notification Center" is the Notification system of the entire OS. Lastly (is that a reel wurd!), you can try turning all notifications OFF in System Prefs->Notifications->Safari: "Allow Notifications". However, you may miss important requests at your front/side/rear doors!
Of course, now I’ll have to visit certain sites (like here) and set them to Allow
I noticed that at the bottom of the pref window it was set to the default for “When visiting other websites: Block and Notify” — so I switched that to Block. Thanks to both of you. Hopefully this adjustment will work.
no answer on how to fix this, other than to live with it.