Appointment not showing as busy after confirmation

Dear Support,

Short version:
I am not seeing the appointment slot show as busy after a successful booking confirmation.

Long Version:
Dr Muller is the only service provider who can perform new patient consultations, they take 30 minutes. When a booking is made and is successfull I am expecting that particlar 30 minute time slot to show as busy.

I have tried Automatic Confirmations (Yes and No). Same failed result.
I have tried Capacity as blank and set to 1. Same failed result.
I have successfully completed all the set-up data (services, service users etc)
Test URL: http://e01b49.com/alliedhealth/make-an-appointment/

I have managed to book 8 appointments across 3 different users in the space of a few minutes (see attachment). For once I would like to see red, the colour of "Busy".

Technical Stuff:
Latest version of Wordpress
Multisite
Ash sent me a beta appointments.php file a few weeks ago to fix being able to add services and services providers and get them to show in the admin section.
Support access has been granted

Please shout if there is more I can do to help complete the booking process by having booked appointment slots show as busy.

Kind regards,
Will