Hello Dora.

Please note that the official support language is English, and we have to use Google Translator to try and understand other languages. Since a lot can be lost in translation, we apologize in advance if we misunderstood some segments of your message, and we also ask you to please translate your future messages to English.

Thank you for your understanding.

Please check your services' Maximum Capacity. If it's above 1, multiple customers will be able to book the same appointment until the Maximum Capacity is filled.

If the service's Maximum capacity is set to 1, access Settings/Appointment Settings and make sure that the "Allow booking above maximum capacity" is disabled. After that, as soon as a single customer books an appointment, the time slot will close.

Also, if you have multiple employees working on the same services at the same time, your customers will be able to book appointments as many times as there are employees.

As for the time - Amelia doesn't have any time zone settings, it inherits the time zone from WordPress. If your time zone is in UTC+/- format, please change it by selecting the city near you. Also, please check if you enabled "Show bookings in customer's time zone" in Amelia's General settings.

If you are in a different time zone than your WordPress site is, and you've enabled this option, the times on front-end will show available time slots in your time zone, which will be the time you set in the back-end +/- the time difference (depending on where you are in regards to the time zone set in WordPress' General settings).

More info about time zones can be found here.