[Resolved] Home page top container acting very strange

Hi there,
Not had any issues for so long, so this is very annoying.
The site supplied has a issue with the top row on the home page.
It is fairly simple a container/grid/2 x containers & content
Heading and button on the left and some text and social icons on the right container.
It appears fine in the browser I am editing it on (Chrome)
But in Firefox, it is not refreshing to see the new version (client started making changes earlier today, whcih I did tidy up – they made some fundamental errors!)
I have cleared every cache – it is on Siteground, and hardly any cache is now on.
I had Perfmatters running, but it is not deactivated.
When I look at the source code on FF, I don’t see the same source code (searching for a phrase that is in the right text column)

Really stumped on this one – any ideas greatly appreciated!

TIA Dave