奇怪的身影随机出现并且不会消失

Question

这个奇怪的图形（下图）随机出现在我的文档开头（在我添加 smartdiagram 包制作图表后占据了一个空间）。我有很多不同的东西，但这个图表不会消失。您认为可能的原因是什么？我该如何解决它？

编辑：我应该提到我删除了全部的文本（所有部分）并且它仍然在那里。以下是序言：

    %% Documentclass:
    \documentclass[manuscript]{stjour}
    \usepackage{tikz}
    \usepackage{smartdiagram}
    \usesmartdiagramlibrary{additions}
    \usepackage{pgfplots}
    \usepackage{caption}
    %\usepackage{neuralnetwork}
    \newcommand\mc[1]{\multicolumn{1}{c}{#1}} % handy shortcut macro

    \pgfplotsset{width=10cm,compat=1.9}
    \usetikzlibrary{arrows}
    %\tikzset{
    %  level/.style   = { ultra thick, blue },
    %  connect/.style = { dashed, red },
    %  notice/.style  = { draw, rectangle callout, callout relative pointer={#1} },
    %  label/.style   = { text width=2cm }
    %}

    %% Manuscript, for double spaced, larger fonts
    % \documentclass[manuscript]{stjour}
    %% Only needed if you use `manuscript' option
    %\journalname{Open Mind}
    \journalname{Computational Psychiatry}
    \def\layersep{2.5cm}

    %%%%%%%%%%% Please supply information %%%%%%%%%%%%%%%%%%%%%%%%%

    %% For Open Mind:
    %% Supplementary Materials:
    \supplementslinks{dx.doi.org/X}

    %% For Computational Psychiatry
    \supportinginfo{dx.doi.org/X}
    %% If no conflicts, this command doesn't need to be used
    %% \conflictsofinterest{}

    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    %% author definitions should be placed here:

    %% example definition
    %\def\taupav{\tau_{\mathrm{Pav}}}
    \begin{document}

    \bibliography{b}
    \end{document}