There is a problem in your contact form on the homepage.
Even though I have filled out all fields, I get the note that “this field is required”. All fields have a green lining around them, and nothing is missing.
So I report it here as a bug, but it’s only because I can’t get in touch with you otherwise.
Meanwhile I got a tip from our server admin staff: maybe you have some script-blocker which prevents the captcha from appearing, and in that case that’s the ‘missing field’ that the page is complaining about.