子图标题位置不正确

Question

无论我删除了多少包，我似乎都无法找出为什么我的子图上的标题被放在了图的顶部而不是下方。我删除了文档中的所有内容，只留下了最基本的部分，但标题仍然放在顶部，尽管我的代码与没有遇到此问题的人的代码相同。到底是怎么回事？我如何强制将子标题放在图像下方，这是标准做法吗？

\documentclass[11pt,a4paper]{article}
\pdfoutput=1

\usepackage{graphicx} % Including graphics

\usepackage{subcaption} % For subfigures

\captionsetup[subfigure]{position=bottom}

\begin{document}

\begin{figure}[t]
%\centering
\begin{subfigure}[b]{0.4\textwidth}
    %\centering
    \caption{Test.
    \label{fig:StNDdbL}}
    \includegraphics[width=1\textwidth]{example-image-a}
\end{subfigure}
\hspace{2ex}
\begin{subfigure}[b]{0.4\textwidth}
    %\centering
    \caption{Test.
    \label{fig:StNDdbP}}
    \includegraphics[width=1\textwidth]{example-image-a}
\end{subfigure}
\\[3ex]

%\centering
\begin{subfigure}[b]{0.4\textwidth}
    %\centering
    \caption{Test.
    \label{fig:StNFbpL}}
    \includegraphics[width=1\textwidth]{example-image-a}
\end{subfigure}
\hspace{2ex}
\begin{subfigure}[b]{0.4\textwidth}
    %\centering
    \caption{Test.
    \label{fig:StNFbpP}}
    \includegraphics[width=1\textwidth]{example-image-a}
\end{subfigure}
\caption{Test.
\label{fig:StImages}}
\end{figure}

\end{document}

Answer 1

正如评论中所说：

将\caption{}下面的图形放入代码中。像这样：

\documentclass[11pt,a4paper]{article}
\pdfoutput=1

\usepackage{graphicx} % Including graphics

\usepackage{subcaption} % For subfigures

\captionsetup[subfigure]{position=bottom}

\begin{document}
    
    \begin{figure}[t]
        %\centering
        \begin{subfigure}[b]{0.4\textwidth}
            %\centering
            \includegraphics[width=1\textwidth]{example-image-a}
            \caption{Test.
                \label{fig:StNDdbL}}
        \end{subfigure}
        \hspace{2ex}
        \begin{subfigure}[b]{0.4\textwidth}
            %\centering
            \includegraphics[width=1\textwidth]{example-image-a}
            \caption{Test.
                \label{fig:StNDdbP}}
        \end{subfigure}
        \\[3ex]
        
        %\centering
        \begin{subfigure}[b]{0.4\textwidth}
            %\centering
            \includegraphics[width=1\textwidth]{example-image-a}
            \caption{Test.
                \label{fig:StNFbpL}}
        \end{subfigure}
        \hspace{2ex}
        \begin{subfigure}[b]{0.4\textwidth}
            %\centering
            \includegraphics[width=1\textwidth]{example-image-a}
            \caption{Test.
                \label{fig:StNFbpP}}
        \end{subfigure}
        \caption{Test.
            \label{fig:StImages}}
    \end{figure}
    
\end{document}