Титульная страница неправильного размера

\documentclass{disser}
\usepackage[koi8-r]{inputenc}
\usepackage[russian]{babel}
\usepackage[a4paper,nohead,includefoot,mag=1000,margin=2cm,footskip=1cm]{geometry}
\author{A.U. Thor}
\title{The title}
\begin{document}
\maketitle

Страница
\end{document}

\documentclass[autoref]{disser}

\usepackage[a4paper,nohead,includefoot,mag=1000,margin=2cm,footskip=1cm]{geometry}
\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english,russian]{babel}
\usepackage{tabularx}
\usepackage{float}

\begin{document}

\institution{inst}
\title{title}

\maketitle

\clearpage

\nsection{Содержание работы}
Во введении
\end{document}

\if@titlepage
  \newcommand\titlefont{\Large\bfseries}
  \newcommand\topiclabelfont{\large}
  \newcommand\topicfont{\large\bfseries}
  \newcommand\instfont{\normalfont}
  \newcommand\cdsep{~-- }
  \newcommand\maketitle{}
  \setcounter{footnote}{0}
\else
  \newcommand\maketitle{%
    \global\let\thanks\relax
    \global\let\maketitle\relax
    \global\let\@maketitle\relax
    \global\let\@author\@empty
    \global\let\@date\@empty
    \global\let\@title\@empty
    \global\let\title\relax
    \global\let\author\relax
    \global\let\date\relax
    \global\let\and\relax
  }
  \def\@maketitle{%
    \newpage
    \null
    \vskip 2em%
    \begin{center}%
      \let\footnotesize\small
      \let\footnote\thanks
      {\titlefont\@title\par}%
      \vskip 1.5em%
      {\large\lineskip .5em%
        \begin{tabular}[t]{c}%
          \@author
        \end{tabular}\par}%
        \vskip 1em%
      {\large \@date}%
    \end{center}%
    \par\vskip 1.5em%
  }
\fi % \if@titlepage