Difference between cbot indicator output and graph indicator value

namespace cAlgo
{
    [Robot(TimeZone = TimeZones.ChinaStandardTime, AccessRights = AccessRights.Internet | AccessRights.Registry | AccessRights.FileSystem | AccessRights.FullAccess)]
    public class TestCbot : Robot
    {

        [Parameter("Another Timeframe2", DefaultValue = "Minute")]
        public TimeFrame AnotherTimeFrame2 { get; set; }

 
        private KFDiff_AMA_Diff cbotKFDiff_SMA_Diff_Sub2;



        protected override void OnStart()
        {

        
            Sub2TimeFrame = MarketData.GetSeries(AnotherTimeFrame2);
            cbotKFDiff_SMA_Diff_Sub2 = Indicators.GetIndicator(Sub2TimeFrame.Close, Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, Param9,
            Param10, Param11, Param12);
 
        }

        protected override void OnTick()
        {
            // Put your core logic here
                      
                        douSub2PLastTemp = cbotKFDiff_SMA_Diff_Sub2.KFDiff_SMA_Diff_Out.LastValue;

                        Print("0 douSub2PLastTemp {0}", douSub2PLastTemp);

    
        }
}

Hi, I am a newbie in composing cBots.

I write my own custom indicator and being called in the cBot. I then use in cTrader's platform and activate my cBot. But I find that the indicator value shown in the graph is difference from my output of indicator value from my code (graph: -0.27, cbot log output: -0.5193). I have enclosed part of my code and the screen capture​. Have I made any mistake when calling the indicator? Thanks a lot.