I think that the problem is the embedded code that defines overflow:hidden on the <html> tag. It suppose to apply only on the iframe’s <html> tag but it applies on the hole page as well.
I am not completely sure, can you share the published site?
Yea, the problem is definitely the <overflow:hidden>
I would try to delete most of what is inside the embed code and leave only this line: <iframe id="typeform-full" width="100%" height="100%" frameborder="0" src="https://baebu.typeform.com/to/GJOK4l"></iframe>
And add this line before the </body> in the page’s settings panel: <script type="text/javascript" src="https://embed.typeform.com/embed.js"></script>