Problema Impaginazione nuovi capitoli a destra

Ciao a tutti,
Non riesco a venire a capo al seguente problema: quando compilo tutti i nuovi capitoli vengono stampati spostati a sinistra, nonostante la proprietà openright dichiarata in \documentclass.
Allego il codice.
`
\documentclass[11pt,letterpaper,titlepage,twoside,openright]{book}
%%%%%%%%%Preambol
\usepackage[italian,english]{babel}
\usepackage{subfigure}
\usepackage{graphicx}
\usepackage{setspace}
\usepackage[font=small,labelfont=bf,labelsep=period,tableposition=top]{caption}
\usepackage{amsmath}
\usepackage{float}
\usepackage{graphics}
\usepackage{fancyhdr}
\usepackage{amssymb}
\usepackage{booktabs}
\usepackage{nomencl}
\usepackage{multicol}
\usepackage{latexsym}
\usepackage{amsthm}
\usepackage{eucal}
%\usepackage{eufrak}
\usepackage{array}
\usepackage{color}
\usepackage{colortbl}
\usepackage{url}
\usepackage{frontespizio}

%%%Style definition
\newenvironment{abstract1}[1][english]
{\cleardoublepage\thispagestyle{plain}\selectlanguage{#1}
\vspace*{\fill}\begin{center}\bfseries\abstractname\end{center}
\vspace{2\baselineskip}}
{\vspace*{\fill}\clearpage}
\newcommand {\fncyblank}{\fancyhf{}}

\linespread{1.2}
\alph{enumi}

\theoremstyle{plain}
\newtheorem{thm}{Teorema}[section]
\newtheorem{cor}[thm]{Corollario}
\newtheorem{lem}[thm]{Lemma}
\newtheorem{prop}[thm]{Proposizione}

\theoremstyle{definition}
\newtheorem{defn}{Definition}[chapter]

\theoremstyle{remark}
\newtheorem{oss}{Osservazione}

%%%%Document

\begin{document}
\frontmatter
%%%%Frontespizio
\input{chapter/frontespizio}

%%%%Impaginazione
\clearpage{\pagestyle{empty}\cleardoublepage}

\pagenumbering{roman}
\pagestyle{fancy}\addtolength{\headwidth}{20pt}
\renewcommand{\chaptermark}[1]{\markboth{\thechapter.\ #1}{}}
\renewcommand{\sectionmark}[1]{\markright{\thesection \ #1}{}}
\cfoot{}

\rhead[\fancyplain{}{\bfseries\leftmark}]{\fancyplain{}{\bfseries\thepage}}
\lhead[\fancyplain{}{\bfseries\thepage}]{\fancyplain{}{\bfseries\rightmark}}

%%%%Dedica

\begin{flushright}
\null\vspace{\stretch {1}}
Alla mia famiglia.
\vspace{\stretch {2}}\null
\end{flushright}

%%%%Abstract
\input{chapter/abstract}

%%%%Index
\clearpage{\pagestyle{empty}\cleardoublepage}
\tableofcontents
\listoffigures
\listoftables
%\pagenumbering{arabic}

%%%%%Chapters
\input{chapter/chapter1}
\mainmatter
\input{chapter/chapter2}
\input{chapter/chapter3}
\input{chapter/chapter4}
\input{chapter/chapter5}
\input{chapter/chapter6}
\backmatter

\input{chapter/chapter7}
%%%%%Bibliography
\nocite{*}
\addcontentsline{toc}{chapter}{Bibliography}
\bibliographystyle{plain}
\bibliography{bibliography2}

\end{document}
`

Cosa sbaglio?
Grazie per l’aiuto…che è urgente 😉