Twoside latex document-class changes spacing behaviour between text and environments

Question

I changed my document from \documentclass[a4paper, 12pt]{report} to \documentclass[a4paper, 12pt, twoside, openright]{report} and after I recompiled the document, the spacing between e.g. some text and a table environment changed. This is the LaTeX code for creating the table with its content:

beschrieben (vgl. Listing \ref{lst:applicationproperties}, Zeile 2-7): \\

\begin{table}[H]
    \sffamily
    \begin{center}
        {\renewcommand{\arraystretch}{1.3}%
        \begin{tabularx}{\textwidth}{|l|X|}
            \hline
            -------CONTENT OF TABLE--------
            \hline
        \end{tabularx}} \quad
    \end{center}
    \caption{Properties einer Spring Datasource} 
\end{table}

Für eine Übersicht aller von Spring Data spezifizierten Properties, bietet die \cite[offizielle Dokumentation von Spring Boot]{spdata:04} eine gute Referenz.

The following two pictures show the issue pretty good I think. Before I changed the doucmentclass, the spacing looked like this:

After the change, the spacing almost doubled and it looks like the text is placed at the very bottom of the page:

I am pretty sure it is not a big problem behind it, but unfortunately I couldn't find a solution for that problem yet. Does somebody know what is wrong there?