Hello Leroy

Thank you for your purchase.

I'm sure there's something not configured correctly, since the plugin works just fine.

Please check what time zone your WordPress General setting says, and if it's the correct time zone. If it checks out, then check if "Time available for booking in advanced" is set to less than 5 hours.

If that too checks out please take a look at the service, since this can be configured per service individually.

If nothing helps, please provide me a temporary WP-admin login for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party. 

You can write credentials here just check Private Reply so nobody can see them except us.

Please note that our working hours are from 10:00 - 17:00, CET, Mon - Fri. We're not prioritizing anyone, and we're going through tickets in the order in which they appear. Due to an increased amount of tickets our response times are longer than expected.