Site won't render properly in iOS Chrome or Safari

I’m experiencing a problem testing a site on iOS Chrome and Safari.

For some reason the site looks fine in the designer and the preview as well as on my desktop browser, but is completely broken on my phone.

Any help would be much appreciated as I have a rapidly approaching deadline on this one!

Here are a couple of screengrabs illustrating the difference:

Here is my site Read-Only: Webflow - Sonic Signatures