如何删除小节标题与其内容之间的空格？

Question

我正在处理LaTeX并编写一个部分，子部分的标题和内容之间有一个很大的垂直空白。我不知道如何删除这个空白（我附上了一张照片以便更好地理解）

在本小节之前的命令中，没有任何奇怪的命令，只有我使用的命令（用于粘贴图形和逐项列出）。

我使用了很多\usepackage：

    \documentclass[12pt, pdftex, pointlessnumbers, twoside, openright] 
    {scrreprt}
    \usepackage{enumitem}
    \newlist{tabitem}{itemize}{1}
    \setlist[tabitem]{wide=0pt, nosep, leftmargin= * 
     ,label=\textbullet,after=\vspace{- 
    \baselineskip},before=\vspace{-0.6\baselineskip}}
    \usepackage{a4}
    \usepackage{ae}
    \usepackage{amsbsy}
    \usepackage{amsfonts}
    \usepackage{amsmath}
    \usepackage{amssymb}
    \usepackage{amsthm}
    \usepackage{array}
    \usepackage{mathtools}
    \usepackage[german,english]{babel}
    \usepackage{bibgerm}
    \usepackage{color}
    \usepackage{epsfig}
    \usepackage{float}
    \usepackage[T1]{fontenc}
    \usepackage{graphicx}
    \usepackage[latin1]{inputenc}
    \usepackage[utf8]{inputenc}
    \usepackage{latexsym}
    \usepackage{layout}
    \usepackage{nomencl}
    \makenomenclature
    \renewcommand{\nomname}{Nomenclature}
    \usepackage{gensymb}
    \usepackage[]{geometry}
    \usepackage{afterpage}
    \usepackage[<options>]{scrlayer-scrpage} % \usepackage[automark] 
    {scrpage2}
    \usepackage{acronym} 
   \usepackage{titling}
   \usepackage{subfig}  % subfigure: Mehrere Unterbilder in einem Bild  
    \usepackage{nomencl}    % nomencl package for Symbol- oder 
    Formelverzeichnis
    %\usepackage{nomencl,etoolbox,ragged2e,siunitx}
    \usepackage{graphicx}
    \usepackage[lofdepth,lotdepth]{subfig}
    \usepackage{trfsigns}
    \usepackage{trsym}
    \usepackage[nice]{units}
    \usepackage{pythontex}
    \newcommand{\pymultiply}[2]{\py{#1*#2}}
    \usepackage{url}
    \usepackage{epstopdf}
    \usepackage[dvips]{geometry} 
    \usepackage{pdflscape}  % pdflscape: Einzelne Seiten im Querformat unter 
    PDF
    \usepackage[dvips]{rotating} % rotating: Drehen von Text und Bildern
    \newcommand{\matvar}[1]{\boldsymbol{#1}}  % Vectors/Matices bold - 
    variable
    \newcommand{\mat}[1]{\begin{pmatrix}#1\end{pmatrix}} % Matrix
    \allowdisplaybreaks
    \makenomenclature 

And this is the part before that happens:

       \clearpage
    
        \item \textbf{Mutation:} At the end, the mutation is applied in 
        order to generate diversity and it is generated at some low 
        probability (i.e. 0.1) \cite{hesser1990towards} - see figure 
        \ref{fig:mutation}.
        \begin{figure}[!htbp]
            \centering
             \includegraphics[width=.45\textwidth]{mutation.jpg}
             \caption{Mutation example}
             \label{fig:mutation}
         \end{figure} 


        Briefly, the following flow chart depicts how the GA works (figure 
        \ref{fig:GA_chart}).
         \begin{figure}[!htbp]
          \centering
          \includegraphics[width=1\textwidth]{GA_chart.jpg}
          \caption{Flow chart from GA}
          \label{fig:GA_chart}
          \end{figure} \clearpage