You could try that if it isn't too much trouble. You could export your xf_notification and xf_notification_dismissed tables first. If reinstalling makes no difference you could always just re-import those tables.
Struggling to envisage what could be causing this...
Have you disabled all notifications apart from a single one with no criteria?
Struggling to envisage what could be causing this...
Have you disabled all notifications apart from a single one with no criteria?