Extra space between title and content with mdframed

Question

I have created a "solution" environment for some lecture notes, and I am experiencing an unexplainable space between the word Solution, which is the title of an mdframed environment and the beginning of the solution, when I starts with a formula. My solution sometimes start with a formula and other with a sentence, so I cannot simply add a negative \vspace to solve the problem. Herewith an example: sorry if it is a bit long.

\documentclass{article}
\usepackage[dvipsnames,svgnames,table]{xcolor}
\usepackage{tikz}
\usepackage{mdframed}
\mdfdefinestyle{ExampleStyle}{%
    skipabove=\topskip,
    skipbelow=\topskip,
    innerbottommargin=2ex,
    linewidth=1pt,
    leftline=false,
    rightline=false,
    frametitlefont={\color{DarkBlue}\normalfont\bfseries},
    frametitlerule=false,
    frametitlebackgroundcolor=White,
    backgroundcolor=White,
    linecolor=DarkBlue}
\mdfdefinestyle{SolutionStyle}{%
    skipabove=\topskip,
    skipbelow=\topskip,
    topline=false,
    roundcorner=10pt,
    frametitlefont={\color{DarkBlue}\normalfont\bfseries},
    frametitle={Solution},
    frametitlerule=true,
    frametitlebackgroundcolor=DarkBlue!10,
    backgroundcolor=DarkBlue!10,
    linecolor=DarkBlue!10,
    fontcolor=DarkBlue}
\usepackage{amsmath,amsthm}
\mdtheorem[style=ExampleStyle]{Example}{Example}[section]
\newmdenv[style=SolutionStyle]{Solution}
\begin{document}
\begin{Example}
Work out~$2 + 3\times 5$.
\end{Example}
\begin{Solution}
[
\begin{split}
2 + 3\times 5 &= 2 + 15 \cr
&= 17
\end{split}
]
\end{Solution}
\end{document}

The outcome is the following: