Frontend form

I use Joomla 5.4.0 and GMapfp Pro v4.10.19. I created a form to submit a location, but I am unable to use it. I get a message "Category is required", even if I selected a category.

I created a mirror site: zandbak.suburbs.be/

Feel free to test whatever you want. This is just a mirror...

Even if I try to modify the GMapFP développement record I get the error.

Thank you for your support.

Frank