Hello,
It appears you have wrapped the images with a table. I would remove this and just leave the image in the modules you have your images published to. Tables will definitely mess up responsive mode for a site:
<table border="0" style="width: 100%;">
<tbody>
<tr>
<td>
<img border="0" src="/~elcubo/images/banersfoot/Pieza_horarios.jpg">
</td>
</tr>
</tbody>
</table>
change to:
<img border="0" src="/~elcubo/images/banersfoot/Pieza_horarios.jpg">