With out knowing what themes you are using it will be hard to help you.
Veryplaintext. But it doesn’t show up on the default Twenty Eleven either.
You need to review what page template is used for each page you created Admin Dashboard>Pages>All Pages>hover a page>Quick Edit (if a page template was theme specific and you switched themes it will default/revert to the new theme’s default page template)…also review with your theme options/template design.
Quick Edit says “Default Template”. I reviewed theme options for the default theme and for my theme and found nothing.