Hi Fred and thanks for getting in touch!
We’re definitely happy to help here. But first, will you please log in and post to the PRO support forum? If you don’t know your password, you can do a password reset. The email will go to the address on the account, which sounds like it will be the email address of your developer.
In the meantime, I would suggest checking your date cutoff settings in Events > Settings and making sure the cutoff time is set to 12:00am. Also, do a double-check to make sure the event was not inadvertently set up as a recurring event.
Thanks!
Geoff