Double entries - Occupied Slots

I am testing the booking system. I notice when I book a service (see attached image) here booking at 8.30am for 2 hours the following (I have added it to the cart at this point):

1. The unavailable time shows my booking as a double entry

2. Even though nothing is booked before 8.30am the time slot still shows at OCCUPIED even though a client could book at 8am for a 15 minutes session which I have setup as well.

Hi,
1. Please re-download and install OS Services Booking 2.5.4 to solve the issue with unavailable time duplicated.
2. Please adjust your Joomla timezone, because if your current time is passed 8:00 AM, the timeslots on that time will be occupied automatically.
Thanks
dam