Bar Graph generating incorrect value

Hello,

I hope this is not a product of my stupidity, but I've smashed my head against this data and it seems like the bar graph is generating the wrong output.

Attached is the dsm($chart) and a printscreen of the output graph. Below is the code I'm using to generate the function. I would really appreciate if you guys could have a look.

Thank you

function aa_custom_accounts_income_chart($year = NULL) {
  
  if (!$year) {
    $year = date('Y');
  }
  
  $chart = array(
    '#chart_id' => 'accounts_main_chart',
    '#title' => chart_title('Income in EUR'),
    '#type' => CHART_TYPE_BAR_V_GROUPED,
    '#size' => chart_size(700, 200),
    '#grid_lines' => chart_grid_lines(30, 15),
    '#bar_size' => chart_bar_size(15, 5), 
  );
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Jan'] = chart_mixed_axis_label(t('Jan'));
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Feb'] = chart_mixed_axis_label(t('Feb'));
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Mar'] = chart_mixed_axis_label(t('Mar'));
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Apr'] = chart_mixed_axis_label(t('Apr'));  
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['May'] = chart_mixed_axis_label(t('May'));
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Jun'] = chart_mixed_axis_label(t('Jun'));
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Jul'] = chart_mixed_axis_label(t('Jul'));
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Aug'] = chart_mixed_axis_label(t('Aug'));
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Sep'] = chart_mixed_axis_label(t('Sep'));  
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Oct'] = chart_mixed_axis_label(t('Oct'));
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Nov'] = chart_mixed_axis_label(t('Nov'));
  $chart['#mixed_axis_labels'][CHART_AXIS_X_BOTTOM][1]['Dec'] = chart_mixed_axis_label(t('Dec'));
  

  $chart['#data']['billed'] = array(0,0,0,0,0,0,0,0,0,0,0,0);
  $chart['#data']['paid'] = array(0,0,0,0,0,0,0,0,0,0,0,0);
  $chart['#data_colors']['billed'] = chart_unique_color('test_a');
  $chart['#data_colors']['paid'] = chart_unique_color('test_b');
  
  $chart['#legends']['billed'] = t('Billed');
  $chart['#legends']['paid'] = t('Paid');

  $max_y = 0;
  
  $view = views_get_view('income_by_date');
  $args = array('2011', 'EUR');
  $view->preview('default', $args);
  
  foreach($view->result as $result) { 
    $month = date('n', $result->node_created) - 1;
    $status = $result->field_field_invoice_status[0]['raw']['value'];
    $chart['#data'][$status][$month] += $result->field_field_invoice_total[0]['raw']['value'];
    if($chart['#data'][$status][$month] > $max_y) {
      $max_y = $chart['#data'][$status][$month]; 
    }
  }

  $chart['#mixed_axis_labels'][CHART_AXIS_Y_LEFT][0][] = chart_mixed_axis_range_label(0, $max_y);
  dsm($chart);
  return theme('chart', array('chart' => $chart));
}