If run an application where there is a DataTable Tool and open the editor of tool, when you check the checkbox Auto offset, the first time it works, but if you uncheck/check again the chart isn't change. Use next code to reproduce the problem: 
  Steema.TeeChart.TChart tChart1;
    public Form1()
    {
      InitializeComponent();
      tChart1 = new TChart();
      this.Controls.Add(tChart1);
      tChart1.Top = 150;
      tChart1.Left = 100;
      tChart1.Height = 400;
      tChart1.Width = 550;
      InitializeChart();

    }
    Steema.TeeChart.Styles.Bar series1,series2;
    Steema.TeeChart.Tools.DataTableTool dataTool;
    private void InitializeChart()
    {
      series1 = new Bar(tChart1.Chart);
      series2 = new Bar(tChart1.Chart);
      series1.FillSampleValues();
      series2.FillSampleValues();
      dataTool = new DataTableTool(tChart1.Chart);
      dataTool.RowPen.Color = Color.Black;
      dataTool.ColumnPen.Color = Color.Black;
          
     
      
    }
    void button1_Click(object sender, EventArgs e)
    {
      tChart1.ShowEditor();
    }