Hi and welcome 🙂
If you are also setting the import status to ‘Draft’ (as seen here), there is unfortunately a bug which duplicates events upon reentry. I don’t see any temporary workaround other than changing the import status, so if that’s possible give it a shot and let me know if events still duplicate.
I’ve added this forum thread to the ticket which helps expedite the process of getting a fix included in an upcoming release. I don’t have a precise date when it will be available, but please stay tuned to our Release Notes and the plugin changelogs for more information. Thanks again and let me know if you’ve got any additional questions or comments. Cheers!