Wordpress form not displaying check boxes or radio buttons

My check boxes in contact Form 7 (and other contact form plugins) isn't working. I tried on various different themes as well. I suspect it's the CSS disabling their visibility but I'm struggling to identify where and what I need to add! Contact form is here, where there is a tick box: https://wedgewoodroadmanagement.co.uk/contact/

Any help would be greatly appreciated!

Many thanks