Weird imperfect table, horizontal line overflow

Question

I've this weird problem where the horizontal lines in a table are overflowing. It might be due to one of the many packages, I'm not sure. Is there a way to forcefully fix the table border.

The latex code used to generate the table is this

\begin{table}%[h]
\caption{test} % title of Table
\centering  % used for centering table
\begin{tabular}{|c|c|c|c|c|} \hline
T & t1  & t2  & t3 & t4 \\ \hline
a & 10\%  & 40\% & 70\% & 95\% \\ \hline
b & 20\%  & 50\% & 80\% & 98\% \\ \hline
c & 30\%  & 650\% & 90\% & 99\% \\ \hline
\end{tabular}
\end{table}

Sample image is:

Answer 1

You need to use \\ \hline (you were missing a slash prior to the \hline):

Code:

\documentclass{article}
\begin{document}
\begin{table}%[h]

\caption{test} % title of Table 
\centering % used for centering table 
\begin{tabular}{|c|c|c|c|c|} \hline 
T & t1 & t2 & t3 & t4 \\ \hline 
a & 10\% & 40\% & 70\% & 95\% \\ \hline 
b & 20\% & 50\% & 80\% & 98\% \\ \hline 
c & 30\% & 650\% & 90\% & 99\% \\ \hline 
\end{tabular} 
\end{table}
\end{document}