Thanks, Joe A
We’ve reinstalled the main part of the theme we use for this site hoping to stop an occasional glitch where the theme doesn’t display properly. There is another premium part of the theme that I can also reinstall but I would then have to reformat some stuff on the site so I’ll wait to do that in hopes the first part fixes the issue.
Update: The website is still experiencing an issue with the theme changing to a different display intermittently. I have posted a support ticket with the theme support group.