Hi Alex, thanks for getting in touch. It would help a lot to have a read-only link to the site, to see how the form is setup. It looks like some custom setup issue: Share a read-only link | Webflow University
Also, if you can share the link to the published page, that will help to see what messages are shown.
There are three instances of the form - the easiest one to access is right at the bottom of the page. If we can crack it there then I’ll apply to the rest.