Internal link leading to the wrong page

Question

Below I write a minimal working example of a document in which one passes from roman numbering (in TOC) to arabic numbering in the "body" of the document.

Note that I use imakeidx package so as to have an index of names/concepts at the end of the document itself.
However, some unexpected error occurs. In fact, with the code below as an input:

\documentclass[12pt,oneside,english]{report} 

\usepackage[a4paper]{geometry}
\geometry{verbose, tmargin=2cm, bmargin=2cm, lmargin=2cm, rmargin=2cm, headsep=0.5cm, footskip=1cm}
\usepackage{imakeidx}
\makeindex[columns=3, options = -s Analyticalindexsetting.mst]
\usepackage[hidelinks]{hyperref}

\begin{document}
\frontmatter
\phantomsection
\linespread{1} 
\thispagestyle{empty}
\large
\begin{center}
   \Large{{\underline{\textsc{University XXXXX}}}}
\end{center}
\vspace{0.1cm}   
\begin{center}   
   \Large{{\textit{DEPARTMENT OF XXXXXX}}}
   \vspace{1.5cm}\\
   \normalsize{\textit{\textbf{MsC Degree}}}\\ \normalsize{\textbf{\\In}}\\ \normalsize{\textbf{\\XXXXX}}   
\end{center}
\vspace{1cm}
\begin{center}
  {\LARGE \textbf{YYYYYYYY} \smallskip\\}                                               
\end{center}
\vspace{3cm}
   \begin{tabular}{ll}
            \textit{DEFENDED BY}      \hspace{5cm}     & \textit{SUPERVISOR}  
            \vspace{0.6cm}   &   JJJJJJJJ\hspace{3cm} & Prof. OOOOO \\
                                
   \end{tabular}

\clearpage 
\begingroup
  \pagestyle{empty}
  \null
  \newpage
\endgroup
\pagenumbering{roman}
\pagestyle{plain}

\phantomsection
\tableofcontents

\chapter{FFFFFFFFFFFFFFFFF}\label{chap: Brownian motion theory}
\justify 
\pagenumbering{arabic}
\lhead{\textbf{\rightmark}}
\section{WWWWWW}\label{subsec: History of Brownian motion}
\justify 
\noindent As pointed out in Hist\index{Hist}...

\printindex
\backmatter

\end{document}

I get an output which comprise five pages:

• thesis title (not numbered);
• blank page (not numbered);
• TOC (numbered by i);
• body (numbered by 1), in which the word "Hist" appears;
• index of names/concepts (numbered by 2).

The last page (i.e. "index of names/concepts" page) appears as follows:

But if I click on number 1 next to "Hist", link leads me to "thesis title" page (which is actually not numbered) and not to the page in which the word "Hist" actually is, namely "body" page (which actually is the one numbered by 1).

I think that the problem is that "thesis title" page is authomatically "recognized" as the first page in the document, hence number 1 in the index authomatically refers to that page and not to the page which is actually numbered by 1 (i.e. "body" page).

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As far as you know, how could it be possible to fix such a problem so as that the link leads exactly to the page which is actually numbered by 1 (that is, "body" page in my above example)?