Two Charts behind

Hallo,

I use the chart add-on and use two ContainerDataSeries (series1 ,series2).
Series2 should be behind series1 (see Attatchment chart.png) and not above.  

How can I solve this problem!
How may I start at position 32 with series2? 

My code:

ContainerDataSeries seriesO =
                new ContainerDataSeries(prod.beanO());
    
    ContainerDataSeries seriesU =
        new ContainerDataSeries(prod.beanU());
  
      
   // Set up the name and Y properties
    seriesO.setName("Oslo");
    seriesO.setNamePropertyId("id");
    seriesO.setYPropertyId("type");
    
    seriesU.setName("Berlin");
    seriesU.setNamePropertyId("id");
    seriesU.setYPropertyId("type");
    
   // Set the category labels on the axis correspondingly
      XAxis xaxis = new XAxis();
      XAxis xaxis2 = new XAxis();
      Labels xlabels = xaxis.getLabels();
      xlabels.setAlign(HorizontalAlign.RIGHT); 
      
      xaxis.setTitle("Location");
      
      
      SolidColor curBandColor = SolidColor.LIGHTBLUE;
      PlotBand plotBand = new PlotBand(32,32.1, curBandColor);
      plotBand.setLabel(new PlotBandLabel("Top 100"));
      xaxis.setPlotBands(plotBand);
      
      conf.addxAxis(xaxis);
      
    YAxis y = new YAxis();
    y.setMin(0);
    y.setTitle("Fälle");
    conf.addyAxis(y);

    Legend legend = new Legend();
    legend.setLayout(LayoutDirection.HORIZONTAL);
    legend.setBackgroundColor("#FFFFFF");
    legend.setHorizontalAlign(HorizontalAlign.LEFT);
    legend.setVerticalAlign(VerticalAlign.BOTTOM);
    legend.setX(100);
    legend.setY(20);
    legend.setFloating(true);
    legend.setShadow(true);
    conf.setLegend(legend);

    Tooltip tooltip = new Tooltip();

    tooltip.setFormatter("this.x +': '+ this.y +' Fälle'");
    conf.setTooltip(tooltip);

    PlotOptionsColumn plotoberhalb = new PlotOptionsColumn();
    plotoberhalb.setPointPadding(0.2);
    plotoberhalb.setBorderWidth(0);

    conf.addSeries(seriesO);
    conf.addSeries(seriesU);

    
    chart.drawChart(conf);