Dominique,
Welcome back! Sorry to hear you’re dealing with duplicate events. Can you provide a little more information on your issue? For example, were the events that are duplicating added manually or did you import them? If imported, were they from a Google Calendar, Facebook, etc?
Are you able to set up a test environment using the default WP theme and only our plugins to see if you can reproduce the behavior? This would be the most ideal situation so you can keep your live site going without any interruptions. We’ll need you to confirm whether or not the issue still occurs using the default WP theme and only our plugins. Please refer to our Testing for conflicts guide for more information.
Once I have more details, I’ll be able to further investigate your issue. Thank you and I look forward to your response. Cheers!