include header file duplication

Hello.
I don't understand why the same header file but different capitalisation
are duplicated and I can't delete them.
If I delete and compile or save the code, compiler writes the deleted
line again.
Can anybody explain this?

#ifndef QFORM_H
#define QFORM_H
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <ComCtrls.hpp>
#include <ExtCtrls.hpp>
#include <Buttons.hpp>
#include "..\jbase.h"
#include "ILstView.h" <----
#include "IQView.h"   <----
#include "ITreView.h"
#include <Menus.hpp>
#include <ImgList.hpp>
#include "Ilstview.h" <----
#include "IQview.h"   <----

There are only the files named ILstview.h, IQview.h

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