Not All My Google Events are Blocking My Noterro Calendar from Being Booked

When you enable Google Two-Way Sync, not all of your events in Google will block your Noterro calendar from being booked.  Only your Google events that are marked as "Busy" will block your calendar from being booked.  Google events that are marked as "Free" will still display on your Noterro calendar, but will not block it.

How Can I Tell if My Google Events are Busy or Free

If you click on your Google calendar event and then on Edit, it will indicate if the event is Busy or Free.  You can change the event to Busy if you want it to block your Noterro calendar from being booked.