Hi,
Thanks for your reply.
It’s a strange one. I have discovered it’s related to the theme (not sure where – it’s not my theme). I tried it on one of my themes and it’s fine.
Basically yes, it’s only doing it on post update, viewing the page externally has no issues at all. Even the widget debug shows the sidebar correctly. Only happens when you do a post update on a page that has a shortcode tag in it.
I’m going through the theme now trying to find anything. If you have any ideas, that would be great.
Thanks so much.