title: Flot stacked bar chart not stacking
body: <p>I've created a Flot stacked bar chart but the blocks don't appear to be stacking - they all start at 0 (at the bottom of the chart).</p>
  
  <p><img src="https://i.stack.imgur.com/OTNY7.png" alt="Flot chart"></p>
  
  <p>The values of the 4 blocks are:</p>
  
  <ul>
  <li>Bright green - 1</li>
  <li>Purple - 28</li>
  <li>Red - 83</li>
  <li>Light green - 195</li>
  </ul>
  
  <p>If it was stacked correctly it should be at a height of 307. Any thoughts on what's wrong?</p>
  
  <pre><code>   drawLineChart: function(el,data,ticks,labelstr) {
        var plot = $.plot(el, data, {
          series: {stack: true,
               lines: {show: false, steps: false},
               bars: {show: true, barWidth: 0.4, align: 'center'}
          },
          xaxis: {
              ticks: ticks
          },
          yaxis: {
              min: 0,
          },
          grid: {
              color: '#aaa',
              borderWidth:0,
              axisMargin:0,
              hoverable: true,
              autoHighlight: false
          },
          legend: {
              show: true,
              position: "ne",
              noColumns: 1
          }
        });
     }
  </code></pre>