incorrect tables and figures numbering in memoir class

Question

I have maybe a silly question. I am trying to write my class notes as a future book, I am using memoir class, but I have just noticed that my figures and tables are labeled like "figure 11" or "table 11" instead of the right way "table 1.1" or "figure 1.1". I am trying to use the recommendatios of previous post but I guess that maybe ¿is my mixtex 2.9 corrupted? this is a sample tex that I am using. Thanks in advance

\documentclass{memoir}
\usepackage{chngcntr}
%\counterwithout{figure}{chapter}
%\counterwithout{table}{chapter}
\renewcommand{\thefigure}{\arabic{chapter}.\arabic{figure}}
\begin{document}
    \mainmatter    %when using this the numbering changes
\chapter{Test Chapter}
\section{Test Section}
    \begin{figure}
    \caption{Caption 1}
    \end{figure}
    \begin{figure}
        \caption{Caption 2}
    \end{figure}
\end{document}