Issue in the Header Row of TableView in a JavaFX Project

My JavaFX project uses a TableView with only two columns ("First Name" & "Last Name").

The issue is that when I run the project in Apache NetBeans IDE, it shows a third (empty) column on the right of the TableView!!!

This screenshot was taken when I ran the project.text

I am attaching the source code of the project.text

Please any help.

Best regards.

I tried to use a TableView in the JavaFX project, but when I ran the project, it showed a new row that I didn't add to the TableView.