I'm wondering why my standalone tikz picture gets cropped mid way through the picture? Code is shown below without the input data files.

\documentclass[tikz,border=0pt]{standalone}
\usepackage{tikz}
\usepackage{geometry}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{graphicx}
\usepackage{pgfplots}
\pgfplotsset{compat=1.12}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
title={$F_x$ vs. Time},
xlabel={Time ($s$)},
ylabel={Force ($N$)},
width=100mm, height=80mm,
xmin=0,
xmax=37.7,
xtick={0,5,10,15,20,25, 30, 35, 40},
xmajorgrids, xminorgrids, ymajorgrids,
legend style={
at={(0.05,0.97)},
anchor=north west,
legend cell align=left
}
]
\end{axis}
\end{tikzpicture}
\end{document}