Outlook Reminder doesn't Dismiss Old Meetings

My outlook somehow keeps reminding me on old meetings that occurred weeks before. Dismissing all or each one doesn't work. It keeps coming back. I tried the suggestion to remove cache, clear reminders and none works.

Finally, the only one that works for me is to open up the details of each one of the old meetings from the reminder and then dismiss them. They never showed up in the reminder ever since.