Unable to apply styles without loosing the work

I am loosing the styles I am applying. I worked most of yesterday and this morning all of the outer wrapper divs on the top half of the page were stripped back dov blocks.

Today I applied the styles again and after closing the browser and reopening the styles are gone.


Here is my site Read-Only: https://preview.webflow.com/preview/usable-an-experience-design-company?utm_medium=preview_link&utm_source=designer&utm_content=usable-an-experience-design-company&preview=42b2dd8fbda9342701d192f1ff3afc89&pageId=5f9f5827b6d9cd1d6639629e&mode=preview*
(how to share your site Read-Only link)