problems compiling .tex into .pdf under OS X 10.10

Background knowledge: - Using Mactex 2014 with the Latexian editor on OS X 10.10 - Landspace .tex-file with 3 columns in the multicols environment (-> check code below)

PROBLEM: When I create a .pdf-file from my original .tex-file with the export function of the Latexian editor (basically it's just compiling my .tex-file), the last column, where I have something written, will be stretched over the entire column. So e.g. if I have two entries, the first one is completely on top of the column and the second entry is on the bottom of the column.

First I thought that the editor had some bugs so I tried creating a .pdf-file with TeXworks, but I had the same problem. Then I switched to my bootcamp partition where I have TeX Live installed. I compiled the file on my win7 partition with TeXworks and everything was fine. The text wasn't stretched and everything worked fine. My conclusion out of my experiences are now that there is probably a problem with the Mactex package or with something else.

Question: Can anyone provide a solution for me, so I can compile my .tex-files under OS X again?

\documentclass[a4paper,pagesize ,landscape, 5pt, fleqn]{scrartcl}
\usepackage[left=0.75cm,right=0.75cm, top=0.75cm, bottom=1cm]{geometry}
\usepackage{multicol}
\usepackage{amsmath, amsfonts, amssymb}
\usepackage{bbm}
\usepackage{tikz}
\usepackage{array,multirow}
\usepackage[T1]{fontenc}
\usepackage{tabularx}


\pagestyle{plain}
\columnsep 30pt
\columnseprule .4pt

\begin{document}

\begin{multicols*}{3}

This is the first entry. \\

This is the second entry. \\

\end {multicols*}
\end{document}