Hi John,
One of your Elements may be generating a custom page title that overrides the default.
Here’s a demo video checking for Elements that adds a page title and hiding it.
https://share.getcloudapp.com/bLuRBXD0
You can use Display Rules to exclude it from any specific page, or Draft it completely and style(or disable) the default page title.
Bonus: I have another page that the Page Content Title is disabled and is grayed out that I can’t enable it!
You may have a Layout element that disables the Content Title.
Here’s another video showing how to re-enable a greyed-out Content Title caused by a Layout element.
https://share.getcloudapp.com/ApukXZrR
Let us know if this helps.