Configuração de margem não consistente

Configuração de margem não consistente

Atualmente estou digitando minha dissertação. O requisito para margem do texto é 2 cm superior, 2 cm direita, 4 cm esquerda e 2 cm inferior. Minha configuração funciona para todas as páginas, exceto as páginas onde os títulos dos capítulos estão localizados. Existe alguma maneira de resolver isso? Estou usando o compilador pdfLaTeX.

**\documentclass[12pt,a4paper]{report}

\usepackage{amsmath, amsthm, amssymb}
\usepackage{array}
\usepackage{anysize}
\usepackage{faktor} 
\usepackage{placeins}
\usepackage{float}
\usepackage{enumerate}
\usepackage{fancyhdr}%for page number font
\usepackage{lmodern}%also for page number font
\usepackage[pdftex]{graphicx}
\usepackage{caption}
\usepackage{booktabs, calc, cleveref}
\usepackage{mathptmx}%Font: Times New Roman
\usepackage{setspace}
\usepackage[font={small},labelfont=bf]{caption}
\usepackage[titles]{tocloft}
\usepackage[notquote]{hanging}
\usepackage{sectsty}.
  \chapternumberfont{\nohang\centering\large\MakeUppercase} 
  \chaptertitlefont{\nohang\centering\large\MakeUppercase}
  \sectionfont{\fontsize{12}{15}\selectfont}
\usepackage{tikz}
\usepackage[final]{pdfpages}
\usepackage[footskip=1cm]{geometry}
\geometry{
   left=40mm,
   right=20mm,
   top=20mm,
   bottom=20mm,
 }
 %%%%%%%
\renewcommand{\cftchapleader}{\cftdotfill{\cftdotsep}}
\renewcommand\cftchappresnum{CHAPTER } 
   \cftsetindents{chapter}{0em}{6em}      

\pagestyle{fancy}
\lhead{}
\chead{}
\rhead{}
\lfoot{}
\cfoot{}
\rfoot{\thepage}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
 %%%%
\fancypagestyle{plain}{
\fancyfoot{}
\fancyfoot[R]{\fontsize{10pt}{10pt}\selectfont\thepage}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}}
\pagestyle{plain}
%%%%
\renewcommand{\contentsname}{Table of Contents}
\renewcommand{\bibname}{REFERENCES}
%%%%%

\setstretch{2}
%%%%%%%%%%%

\begin{document}
\pagenumbering{arabic} 
\setcounter{page}{1}
%Chapter 1
\chapter{\MakeUppercase{INTRODUCTION}}

\section{Background of study} 
Associating a group with a graph and finding relationships between them is 
an area of research that has generated much interest. Research on this 
subject aims at investigating relationships between groups and graphs and at 
exploring applications of one to the other.
\newpage
The main contributions of this work
\end{document}**

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