How to lose extra heading title in compile
There are two common causes of this problem.
First, it’s possible to actually duplicate the title on an item in the Binder. Try to edit the title and see if there is a second line, containing the duplicate title.
Second, if you have the title both in the Binder and in the body text, you need to use a Section Layout that doesn’t include the Binder title.
If neither of those suggestions helps, could you explain what you’re seeing in more detail, please?