Appointment added into GCal automatically

Hi there,

When I try to make an appointment as a client, after selecting the time slot, service provider, keying in my Name, email and phone, I clicked confirm appointment.

What happened is that the appointment which I booked was added into the Google Calendar account which I keyed in the Email field when making that appointment. Despite checking YES or NO for "Access Google Calendar and submit appointment", the appointment is added in my Google Calendar.

Please advise.