texlive 2014, Linux. MWE
\documentclass{article}%
\usepackage{lipsum,multicol}
\begin{document}
\begin{multicols}{2}
\section*{Introduction}
This is introduction
\columnbreak
\section*{my section}
This is my section
\end{multicols}
\end{document}
Here is the PDF and the HTML output side by side. Notice htlatex output has an extra word auto in the output.
This can only be a bug? removing \columnbreak removes the word auto from the HTML page.
