Website defaulting to Mobile View on Desktop?

Looking at the main website shows it in what looks like a stretch mobile view mode despite being in desktop. Another thread suggested clearing cache and this was attempted but that didn’t do anything - more weirdly it’s possible to catch the application in it’s normal view slightly before it finishes loading but once it finishes loading it changes back to Mobile View

Hitting Escape to stop the website from loading all the way catches it in “Normal” Mode

But the website looks “Fine” if you look at it in “Mobile Mode”