SVG from Inkscape to LaTeX ruins typesetting

I would like to use the .pdf_tex option for my SVG images exported from Inkscape because it's an amazing feature but it doesn't work as intended.

What I do:

1. Export image from Inkscape

2. Integrate into TeX by

   \begin{figure}    \centering    \def\svgwidth{\columnwidth}    \input{N1N2N3.pdf_tex}\end{figure}

3. Compile

Result:

In the PDF

My original SVG:

So thats not what I expected.Can you help me to get it tidy and neat?

So I fixed it partly by using

\begin{center}\resizebox{2in}{!}{\input{inkscapeout.pdf_tex}}\end{center}

to scale text and image together but I still got a problem with the xlabel of the graph because the numbers are moved into the graph and also the legend is moved a little upward.

New result

I uploaded my original svg-file here

https://owncloud.tu-berlin.de/index.php/s/8pRPwotDkiS0C5K