That’s strange. I checked the page’s General Settings > Page Header Options but the settings are equal in both pages. Also the “Subtitle for this page” option is set OFF in the second page’s settings.
Did you perhaps edited any of the theme files? Or installed any new plugin recently? Please deactivate all third party plugins first. Then upload a fresh copy of theme files directly into the wp-content/themes folder in your server using a ftp connection. Rename it in order to keep your current copy. Then in your Appearance > Themes, activate the newly added theme. See if the situation persists.
Let us know how it goes.
