This is an X Theme. I was in the editor customizing and I was adding some widgets to my sidebar when all of the sudden I get a message from X:
Your theme has 9 widget areas, but this particular page doesn’t display them.
You can navigate to other pages on your site while using the Customizer to view and edit the widgets displayed on those pages.
Something went awry. No plugins were added. This happened in a matter of minutes during editing.
Thanks,
Rich