Different look in preview and designer and published site

Hi there,
I have created a single page website with web flow and everything looks good in the editor but as soon as I publish it and try to open it on another device whole website just breaks.
sometimes it breaks in preview mode also but it gets fixed with a simple refresh that is no the case with a published website.

Editor Screenshot

Published website Screenshot

Please Help.

Here is my site Read-Only:

(how to share your site Read-Only link)