Thank you for your help. I'm not sure what was causing it but I finally got it fixed. There was a linebreak at the end of the graph addGraph(). I made it twice.
$docx->addBreak(array('type' => 'line'));
$docx->addBreak(array('type' => 'line'));
the weird part is that if you use the one below it does not work :)
$docx->addBreak(array('type' => 'line', 'number' => 2));
anyway, thought I'll share.