Background image doesn't stick to the viewport on mobile

I have a background image on a body element, that is set to fixed.
It works just fine for PC viewport, it doesn’t work for phone. This occurs only on a published website.

Read-only:
https://preview.webflow.com/preview/laleesh-web-design-graphic-design?utm_medium=preview_link&utm_source=designer&utm_content=laleesh-web-design-graphic-design&preview=6a91c371fd060e4ef6c1baeb7d0dae30&workflow=preview