Notifications not appearing right away

Hello! My team is experiencing notification issues. Some team members receive notifications from content that was posted some time ago - up to an hour. I tested myself and noticed that I was tagged in something 6 minutes ago but do not see any notification for it. And I have enabled all notifications in my settings.

My team relies pretty heavily on quick communication via Monday.com, so any help / insight you can provide would be much appreciated. Thanks!