Trial booking

I just did a trial booking for a Student A, being booked with 'Teacher'. The Teacher's calendar has one date Mon. Sept. 2 at 8:40pm. The Teacher's email has Mon. Sept. 9 at 8:40pm.

I also logged on as Student B and the time slot at 8:40pm on both Sept. 2 and Sept.9 is available.

In the configuration "Employee can work in multiple services at the same time" is set to "No".

Also, when I have "My Working Calendar" on the screen and mouse-over an appointment, the appointment disappears.

There are other concerns but these are very important

I'm troubleshooting with the same employee, of course

Hi Orran,
I am confuse with your explanation. Can you please submit new ticket and provide us your site information with super admin account. We will check to find the problem with your OS Services Booking.
Thanks
Dam