Instead of 2nd author, corresponding indication is showing wrongly for the 1st author in bmcart.cls

Question

If I have only one address and author count is 2, and the 2 second is the corresponding author that time corresponding indication is showing wrongly for the 1st author bmcart.cls

    \documentclass{bmcart}
    \def\includegraphic{}
    \def\includegraphics{}
    \startlocaldefs
    \endlocaldefs


    \begin{document}
    \begin{frontmatter}
    \begin{fmbox}
    \dochead{Research}


    \title{A sample article title}


    \author[
       addressref={aff1},                   % id's of addresses, e.g. {aff1,aff2}
       noteref={n1},                        % id's of article notes, if any
       email={[email protected]}   % email address
    ]{\inits{JE}\fnm{Jane E} \snm{Doe}}
    \author[
       addressref={aff1},
       corref={aff1},                       % id of corresponding address, if any
       email={[email protected]}
    ]{\inits{JRS}\fnm{John RS} \snm{Smith}}


    \address[id=aff1]{%                           % unique id
      \orgname{Department of Zoology, Cambridge}, % university, etc
      \street{Waterloo Road},                     %
      %\postcode{}                                % post or zip code
      \city{London},                              % city
      \cny{UK}                                    % country
    }
    \begin{artnotes}
    \note[id=n1]{Equal contributor} 
    \end{artnotes}

    \end{fmbox}

    \begin{abstractbox}

    \begin{abstract} % abstract
    \parttitle{First part title} %if any
    Text for this section.

    \parttitle{Second part title} %if any
    Text for this section.
    \end{abstract}


    \begin{keyword}
    \kwd{sample}
    \kwd{article}
    \kwd{author}
    \end{keyword}



    \end{abstractbox}
    %
    %\end{fmbox}% uncomment this for twcolumn layout

    \end{frontmatter}

    \begin{backmatter}

    \section*{Competing interests}
      The authors declare that they have no competing interests.

    \section*{Author's contributions}
        Text for this section \ldots

    \section*{Acknowledgements}
      Text for this section \ldots
    \bibliographystyle{bmc-mathphys}
    \bibliography{bmc_article}      
    \end{backmatter}
    \end{document}