Thanks @Prasant, unfortunately that hasn’t helped.
From observing the behaviour on my phone and moving some elements around I believe the problem is caused by the Counter not thinking it is visible.
On my phone, where the elements wrap and provide a scrollbar, once I scroll to the counter it starts counting.
On the desktop I’ve set the Revolution margins to add a 80px space at the bottom of the homepage so the counters are always visible, but it seems they don’t realise they are visible.
I think this is also why the Chrome “Inspect” panel triggers the counting - because it activates the scroll bars and I have to scroll down to see the counters.
I couldn’t see any options on the counter element that would “Count when not visible” - is there any way I can set an option like that? (maybe with CSS?)
Thanks for your help and your quick reply.
Jon.