Usando 'vwcol' varias veces por separado

Question

Estoy intentando usarlo vwcolvarias veces por separado, pero no da el resultado deseado. ¿Alguna idea de cómo solucionarlo? ¿O tal vez sugerencias para un paquete diferente? Por la presente un MWE:

\documentclass[12pt]{my_cv}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage[a4paper, total={7in, 11in}]{geometry}
\usepackage{xcolor, enumitem, multicol, hyperref, vwcol}

\definecolor{darkmidnightblue}{rgb}{0.0, 0.2, 0.4}

\setlength{\columnseprule}{1pt}
\def\columnseprulecolor{\color{darkmidnightblue}}
\setlength{\columnsep}{.5cm}

\hypersetup{colorlinks, urlcolor=darkmidnightblue}
%-------------------------------------------------------------
\begin{document}
%\pagecolor{lightgray}

\name{\color{darkmidnightblue} \textbf{-}
\vspace{.3em}
\name{\color{darkmidnightblue} \large \textit{Curriculum Vitae}}
\vspace{.5em}

\section*{\color{darkmidnightblue} Personal data}
\begin{description}[itemsep=0em, align=left, labelwidth=1.55in]
\item [Date of birth] -
\item [Address] -
\item [E-mail] -
\item [Mobile] -
\end{description}

\section*{\color{darkmidnightblue} Education}

\begin{vwcol}[widths={0.23, 0.5}, sep=.5cm, rule=1pt, postrule, indent=0em, rulecolor=darkmidnightblue, justify=flush]
\textsc{Sep 2018 -- Dec 2018}
\subsection{-} \vspace{-.8em}
\subsubsection{-} \vspace{-.8em}
-
\end{vwcol} 

\begin{vwcol}
...
\end{vwcol}
\end{document}

Archivo de clase:

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{my_cv}[2019/08/11 My custom CV class]
\LoadClass{article}


\newcommand{\name}[1]{%
  \leftline{\Large{#1}}
}

\RequirePackage{titlesec}
\titleformat{\section} % Customise the \section command 
  {\large\bfseries\scshape\raggedright} % Make the \section headers large (\Large)
    {}{0em}
  {}
  [\color{darkmidnightblue}\bfseries\titlerule] % Inserts a horizontal line after the heading

\titleformat{\subsection}
  {\large\bfseries\scshape\raggedright}
  {}{0em}
  {}

\titleformat{\subsubsection}
  {\large\scshape\raggedright}
  {}{0em}
  {}

\newcommand{\datedsection}[2]{%
  \section[#1]{#1 \hfill #2}%
}
\newcommand{\datedsubsection}[2]{%
  \subsection[#1]{#1 \hfill #2}%
}