Tabularx and multirow overflowing

I am trying to span a row over two rows in a tabularx table with the following:

\begin{table}[h]    \caption{Table caption}    \hfill    \begin{tabularx}{\linewidth}{|X|X|X|X|}        \hline \\        \textbf{Column1} & \textbf{Column2} & \textbf{Column3} & \textbf{Column4} \\ \hline    Row1 & Text1 & \multirow{2}{*}{Spanning text that may need to be wrapped in the column} & 500 \\ \hline    Row2 & Text2 & & 500\\ \hline     Row3 & Text3 & SomeOtherText & MoreText \\ \hline    \end{tabularx}\end{table}

However currently getting:Image may be NSFW.
Clik here to view.

• The spanning text is overflowing
• A horizontal line is being drawn between the spanning cells
• Something strange with the lines around "Column2", "Column3", "Column4"

(compiling with pdflatex)

What is the simplest way to fix this...?