Site not working on devices

I recently connected my site to Netlify DNS. The site works on my laptop but doesn’t work on a host of other devices.
This is the Netlify site ->

This is the main site ->

hey @Vicradon, welcome.

this is what i am seeing (through your custom domain)

which other devices are you testing on?

It comes up fine (as far as I can see) on macOS and iOS, so if there is a problem it most likely is not with Netlify, but rather with a CSS media query or JavaScript browser sniffing.