My computer is feeling the Halloween vibes, it's possessed. My @SlackHQ notifications make sound but the number of unreads is way off & no preview notifications of new messages. My @googlecalendar just pinged reminding me of 2 Twitter chats that happened an hour ago. WTH?!pic.twitter.com/qpXEfRuzsF
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Double double toil & trouble!
Are you on the desktop app? If so, can you try clearing cache? To reset the cache, click into the app and select Help > Troubleshooting > Clear Cache & Restart from the very top hamburger menu (Windows)/ top left menubar (Mac).Notifications badge and bubble! 
Not to worry, we've got some real wizards on the notifications team.
