HiddenPostProcess Search Time Range changed.

I am currently running a single hidden search to power all the graphs on my dashboard.

The time range for the base search is 3 hours.

  <module name="HiddenSavedSearch" layoutPanel="panel_row1_col1" autoRun="True">
  <param name="savedSearch">Search Base</param>

The PostProcess then does another search to filter the results, which also works correctly.

However when the time chart is created the MIN & MAX Time Range is changed to first/last seen events, when I need it to stay as 3 Hours.

It works correctly if I run the search manually, is there something I'm missing?

<module name="HiddenPostProcess" layoutPanel="panel_row2_col1_grp1">
 <param name="search"> search page="www.homepage.com" | timechart span="5m" count by Status_Code | fillnull value=0 </param>

<module name="HiddenChartFormatter">
      <param name="chart">bar</param>
      <param name="charting.axisY.minimumNumber"> </param>
      <param name="charting.axisY.maximumNumber"> </param>
      <param name="charting.chart.axisX.includeZero">true</param>
      <param name="charting.chart.nullValueMode">zero</param>
      <param name="charting.legend.labels">[500,404,200]</param>
      <param name="charting.seriesColors">[0xFF0000,0xFFE87C,0x41A317]</param>
      <param name="charting.legend.masterLegend"></param>
     <param name="charting.primaryAxisLabels.majorLabelVisibility">hide</param>
      <param name="charting.chart.stackMode">stacked</param>
      <param name="primaryAxisTitle.text"> </param>
      <param name="secondaryAxisTitle.text"> </param>
      <param name="legend.placement">top</param>
        <module name="FlashChart">
          <param name="width">100%</param>
          <param name="height">435px</param>
        </module>
    </module>

Any thoughts would be helpful!

Thanks.