I am having a problem when editing my site's navigation bar. The "Site Navigation Bar (automatically links to all pages ....)" is ticked but, for the first time today, when I deleted a button, it was only deleted from that page. I discovered this when I published the change and realised that the button was still showing. I have had to delete the button on every page of my site. This has never happened before so I have obviously done something to cause it. Can someone help please?