ctrader bug? Wrong values cBot vs indicator: polynomial regression

Hi,

I was testing the sample code from ctrader for polynomial regression. But it seems that I get different results/values if I use the function PolynomialRegressionChannels from ctrader within a cbot compared to the indicator.

here is the cbot example from ctrader, that I modified, so that it only prints me the values sql and sqh.

using cAlgo.API;
 using cAlgo.API.Indicators;
 namespace cAlgo.Robots
 {
     // This sample cBot shows how to use the Polynomial Regression Channels indicator
     [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
     public class PolynomialRegressionChannelsSample : Robot
     {
         private double _volumeInUnits;
         private PolynomialRegressionChannels _polynomialRegressionChannels;
         [Parameter("Volume (Lots)", DefaultValue = 0.01)]
         public double VolumeInLots { get; set; }
         [Parameter("Label", DefaultValue = "Sample")]
         public string Label { get; set; }
         [Parameter("Source")]
         public DataSeries Source { get; set; }
         public Position[] BotPositions
         {
             get
             {
                 return Positions.FindAll(Label);
             }
         }
         protected override void OnStart()
         {
             _volumeInUnits = Symbol.QuantityToVolumeInUnits(VolumeInLots);
             _polynomialRegressionChannels = Indicators.PolynomialRegressionChannels(2, 170, 2, 3);
         }
         protected override void OnBar()
         {
            
                Print(" _polynomialRegressionChannels.Sql.Last(1) = {0}, <= _polynomialRegressionChannels.Sqh.Last(1) = {1}",  _polynomialRegressionChannels.Sql.Last(1),_polynomialRegressionChannels.Sqh.Last(1));
             
                
             
         }
         
     }
 }

But this values don't match with the values from the Indicator like you can see in the screen shot:

Am I doing something wrong or is this a bug?