Odd lines that aren't entered after the titlepage

Question

I'm working on my report and after putting a lowercase in the titlepage name, somehow weird numbers end up underneath the titlepage on an empty page. The numbers are: _033303333.27 04453.37 13713.48. Does anyone have an idea how to resolve this problem. I am not an expert at LaTeX.

\documentclass[11pt, a4paper]{report}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage{cite}
\usepackage{float}
\usepackage[font=footnotesize,labelfont=bf]{caption}
\usepackage{graphicx}
\usepackage{gensymb}
\usepackage{letltxmacro}
\usepackage{fancyref}
\usepackage[table]{xcolor}
\usepackage[nottoc,numbib]{tocbibind}

\title{Switching off the genes Llmg{\_}0333, Llmg{\_}0445 and Llmg{\_}1371 by using the >knock-out technique in \textit{Lactococcus lactis} strain MG1363.}
\author{Major report LABlab februari 2014\\
\\
\textit{by}\\
\\
(...)\\
(...)\\
(...)\\
(...)\\
\\
\textit{project ran at}\\
\\
(...)\\
\\
\textit{in cooperation with}\\
\\
(...)\\
\\
\textit{guided by}\\
\\
(...)}
\maketitle

\begin{document}

Answer 1

User egreg already stated, that the problem is that \maketitle appears before \begin{document}, the underscore character can be achieved by typing \_.

I introduced the command \Gennum which expects the mandatory gennumber as 2nd argument, the first one is optional and defaults to Llgm. The underscoring is done automatically.

\documentclass[11pt, a4paper]{report}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage{cite}
\usepackage{float}
\usepackage[font=footnotesize,labelfont=bf]{caption}
\usepackage{graphicx}
\usepackage{gensymb}
\usepackage{letltxmacro}
\usepackage{fancyref}
\usepackage[table]{xcolor}
\usepackage[nottoc,numbib]{tocbibind}

\newcommand{\Gennum}[2][Llmg]{%
#1\_#2%
}%

\title{Switching off the genes \Gennum{0333}, \Gennum{0445} and \Gennum{1371} by using the \emph{knock-out} technique in \textit{Lactococcus lactis} strain MG1363.}


\author{Major report LABlab februari 2014\\
\\
\textit{by}\\
\\
(...)\\
(...)\\
(...)\\
(...)\\
\\
\textit{project ran at}\\
\\
(...)\\
\\
\textit{in cooperation with}\\
\\
(...)\\
\\
\textit{guided by}\\
\\
(...)} % End of title

\begin{document}
\maketitle
\chapter{I can only guess what comes here}
\end{document}