tabularx right bar half of left bar

Question

So I'm trying to add a table to the header of my document. Basically I'm trying to match the style created in MS Word originally.

\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand\headrule{}

\lhead{     
\begin{tabularx}{\textwidth}{|X r|} 
\hline\\    
Title: Title Here & Process Instruction\\
\hline  
\end{tabularx}  
}

Output has a right bar that is half of the left bar:

I can't figure out why it's doing this.

Answer 1

There's a & missing after \hline if some some explicit empty line is wanted, if no such line is requested, just remove \\ after \hline

\documentclass{article}


\usepackage{tabularx}
\usepackage{fancyhdr}
\usepackage{blindtext}
\pagestyle{fancy}
\renewcommand\headrule{}


\lhead{%     
\begin{tabularx}{\textwidth}{|X r|} 
\hline 
& \\    
Title: Title Here & Process Instruction\\
\hline  
\end{tabularx}%  
}

\pagestyle{fancy}

\begin{document}
\blindtext[20]

\end{document}