hyperref pagebackref: page number and link in references wrong

Hello,

I try to use hyperref with pagebackref to get a page number and a link
for each of my references. My first pages have roman numbers (title
page, ...), later on I switch to arabic numbers.
For whatever reason the links in the references have the right page
number but the link is wrong (somehow a negative offset).

I have a minimal example:

\documentclass[a4paper, 12pt, twoside]{report}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[english,ngerman]{babel}
\usepackage[left=4cm,top=3cm,right=3cm,bottom=4cm]{geometry}
\usepackage[pdftex, plainpages=false, hypertexnames=false,
pdfpagelabels=true, hyperindex=true, linktocpage, pagebackref=true,
pdfa=true]{hyperref}

\begin{document}
\pagenumbering{roman}
\pagestyle{empty}
Titel

\setcounter{page}{1}
\tableofcontents
\newpage

\pagenumbering{arabic}
\pagestyle{plain}
\chapter{one}
\section{one}
\newpage

\section{two}
Zitation~\cite{citation_key}

\bibliographystyle{plain}
\begin{thebibliography}{widest-label}
\bibitem{citation_key}Autor: Titel. Verlag, Jahr.
\end{thebibliography}
\end{document}

Any ideas?

Tobias
.

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