Switching between languages - stuck on one language

Hello

I use the Service Booking on a 2 language Joomla site. I have created an article and am calling the OS Service booking component in using Regularlabs plugin {component index.php?option=com_osservicesbooking&view=default&lang=en&employee_id=7}

Here is the link to the page: Booking page with language switcher

As you can see when you come in you are on the English part of the website but the OS Service Booking shows the German part.

Thanks

Hi Ozwest,
As i checked in the link you sent, OS Services Booking is showing English
Thanks
Dam