不带标号的标题居中问题

想居中不带编号的标题，并在目录中显示，但是出现了这种情况
发行版：TeXLive2020
VScode编写
MWE:

\documentclass{article}
\usepackage{ctex}
\usepackage{graphicx,titletoc}
\newcommand*{\song}{\CJKfamily{zhsong}} % 宋体
\newcommand*{\hei}{\CJKfamily{zhhei}} % 黑体
\newcommand*{\kai}{\CJKfamily{zhkai}} % 楷书
\renewcommand{\baselinestretch}{1.25}    % 1.5倍行距
\newcommand{\erhao}{\fontsize{22pt}{33pt}\selectfont}
\newcommand{\sanhao}{\fontsize{16pt}{24pt}\selectfont}
\newcommand{\sihao}{\fontsize{14pt}{21pt}\selectfont}
\newcommand{\xiaosi}{\fontsize{12pt}{18pt}\selectfont}
\newcommand{\wuhao}{\fontsize{10.5pt}{\baselineskip}\selectfont}
\ctexset{
    section={
        format={\zihao{3}\heiti},
        name={},
        aftername={\hspace{1em}},
        number=\arabic{section},
    },
    subsection={
        format={\zihao{4}\heiti},
        name={},
        aftername={\hspace{1em}},
        number={\arabic{section}.\arabic{subsection}},
    },
    subsubsection={
        format={\zihao{-4}\heiti},
        name={},
        aftername={\hspace{1em}},
        number={\arabic{section}.\arabic{subsection}.\arabic{subsubsection}},
    },
    paragraph={
        format={\zihao{-4}\heiti},
        name={},
        aftername={\hspace{1em}},
        number={\arabic{section}.\arabic{subsection}.\arabic{subsubsection}.\arabic{paragraph}}
    },
    appendix={
        name={附录,：},
        number=\arabic{section},
    }
}
\titlecontents{section}
    [0mm]
    {\xiaosi \hei \vspace{7.5pt}}%
    {\contentslabel{6.35mm}}%
    {}%
    {{~\titlerule*[0.6pc]{$.$}~\contentspage}}%
\titlecontents{subsection}
    [3.175mm]
    {\xiaosi \song \vspace{7.5pt}}%
    {\contentslabel{9.525mm}}%
    {}%
    {{~\titlerule*[0.6pc]{$.$}~\contentspage}}%
\titlecontents{subsubsection}
    [6.35mm]
    {\xiaosi \song \vspace{7.5pt}}%
    {\contentslabel{12.7mm}}%
    {}%
    {{~\titlerule*[0.6pc]{$.$}~\contentspage}}%
\titlecontents{paragraph}
    [9.525mm]
    {\xiaosi \song \vspace{7.5pt}}%
    {\contentslabel{15.875mm}}%
    {}%
{{~\titlerule*[0.6pc]{$.$}~\contentspage}}%
\newcommand\specialsectioning{\setcounter{secnumdepth}{-2}}
\title{标题标题标题}
\begin{document}

 \section{一级标题} 
    
    文本文本

    \newpage
    \specialsectioning
    \centering{  \section{总结与展望} }
    
    文本文本
\end{document}

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