Check your page’s HTML header. Go to the property editor for the page itself, and at the bottom is an input for the page’s header. You might have it written in there rather than it hanging out in a text element.
In the toolbar on the left you have something that says “elements tree” click it and everything there should have an icon that looks like an eyeball. Try locating an item in that list that has the eye ball crossed out. If it is crossed out, click it to undue and the item should appear wherever it is on the page.