# Multicolumn row line display

I am having a weird problem on a row line, with the following code :

\begin{adjustbox}{width=1\textwidth}
\small
\begin{tabular}{| l |*{3}{c |} l | l |}
\hline
\multicolumn{1}{| c |}{\textbf{Title}}  & \multicolumn{3}{| c |}{\textbf{Model}} & \multicolumn{1}{| c |}{\textbf{Techniques}} &  \multicolumn{1}{| c |}{\textbf{Performances}} \\  \cline{2-4}
& \textbf{Battery} & \textbf{EV} & \textbf{Grid} &  \\  \hline

\end{tabular}


This give me the following header :

where the line for the last row "Performances" is not complete. Do you know why it happened ? If I remove this column, I don't have the problem anymore, I don't really get why it is happening.

Thanks !

You need another & in the second line.

I've also added \setlength\extrarowheight{2pt} to increase a bit the row height.

\documentclass{article}
\usepackage{array}
\setlength\extrarowheight{2pt}

\begin{document}