Available timeslots randomly change

Hi,

I recently set up a bookable service with a 1:10 attendee scheme. The time increments for the bookable slots are 30 minutes starting at 17:00 (UTC+01:00) time with a duration of 10 minutes. Upon setting up the slots showed correctly as follows: 17:00, 17:30, 18:00, 18:30.

However, when the first slot at 17:00 was completely booked by 10 customers the service now shows different slots: 17:10, 17:40, 18:10, 18:40. This is not what I wanted since it opens up new slots which are each bookable by 10 further customers. I expect the timeslot at 17:00 to simply disappear.

Here are my configurations:

• Region and time zone settings selected as "always show time slots in business time zone"
• Time increments: 30 minutes
• Duration: 10 minutes
• No buffer time
• Default scheduling policy: deactivated

Thank You