Only some appointments showing on provider's GCal

First of all, thank you for such a great plugin!

I am running into a strange issue where only some appointments are showing on providers' GCal. The appointments are being loaded from the admin panel.

It is strange because about half don't show up on GCal and the others do. There are even some that are showing in GCal but not in the appointments list. I verified that all of the appointments are "confirmed."

Have you heard of this? Is there anything that I can do to trouble shoot? I can give a wpmu employee the login creds if that will help.

Thanks so much!