Hey William,
Thank you for reaching out to us! I’m very sorry about this issue you are experiencing.
I’ve ran some tests and the only way I’ve found to reproduce the issue you are experiencing from here, was when the Event start date was set to 2018-06-03 while the recurrence date was set to 2018-06-02 (check this screenshot). Please note that you can’t set the Event Date to 06/03 and start the Event Series in the past (in this case, 06/02).
I hope this helps! Let me know if you need anything else in the mean time, please let me know and I’ll be happy to assist!
Regards,
Patricia