Table width to \linewidth in twocolumn environment

Question

I tried make a table whose width is one-column linewidth in twocolumn environment. So I used table* and tabular*.

\begin{table*}[t] 
caption{Some captions...}
\begin{tabular*}{\textwidth}{|l|l|l|}\hline
Table contents...
\end{tabular*}
\end{table*}

But it gives me an output whose right vertical line is not properly positioned:

Would you tell me why this happens or recommend another method to do it?