Tick Volume discrepancy?

Hi,

I have noticed that OnTick() gets called more often than the number of times indicated by the tickVolume.

The output of the following Robot code illustrates this.

Robot Code:

using System;
using System.IO;
using cAlgo.API;

namespace cAlgo.Robots
{
    [Robot]
    public class Test : Robot
    {
        StreamWriter logWriter;
        double actualTicks;
        
        protected override void OnStart()
        {
            // Create a new log file on the User's Desktop.
            logWriter = 
                File.CreateText(
                    Path.Combine(
                        Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), 
                        Symbol.Code + "_" + Server.Time.ToString("ddMMyyyy_HHmm") + ".csv"));
            logWriter.AutoFlush = true;
            logWriter.WriteLine("Open Time, Open, High, Low, Closed, Bid, Ask, Tick Volume, Actual Ticks");
            actualTicks = 0;
        }
        
        protected override void OnTick()
        {
            // Start counting ticks at the start of a bar.
            if (actualTicks == 0 && MarketSeries.TickVolume.LastValue == 1) actualTicks = 1;
            
            // Wait until the start of a bar.
            if (actualTicks == 0) return;
            
            // Reset countedTicks at the start of a bar otherwise increment.
            actualTicks = (MarketSeries.TickVolume.LastValue == 1) ? 1 : actualTicks + 1;
            
            //Write data to file, indicating Tick Volume discrepancies with a *.             
            logWriter.WriteLine(MarketSeries.OpenTime.LastValue.ToString("dd/MM/yyyy, HH:mm:ss") + ", " +
                                MarketSeries.Open.LastValue.ToString("F0" + Symbol.Digits) + ", " + 
                                MarketSeries.High.LastValue.ToString("F0" + Symbol.Digits) + ", " +
                                MarketSeries.Low.LastValue.ToString("F0" + Symbol.Digits) + ", " +
                                MarketSeries.Close.LastValue.ToString("F0" + Symbol.Digits) + ", " +
                                Symbol.Bid.ToString("F0" + Symbol.Digits) + ", " +
                                Symbol.Ask.ToString("F0" + Symbol.Digits) + ", " +
                                MarketSeries.TickVolume.LastValue + ", " +
                                actualTicks + (actualTicks != MarketSeries.TickVolume.LastValue ? "*" : ""));
        }
        
        protected override void OnStop()
        {
            // Close logfile.
            logWriter.Close();
        }
    }
}

Robot Output:

Open Time, Open, High, Low, Closed, Bid, Ask, Tick Volume, Actual Ticks
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28875, 1.28875, 1.28875, 1.28876, 1, 1
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28874, 1.28874, 1.28874, 1.28876, 2, 2
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28871, 1.28871, 1.28871, 1.28872, 3, 3
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28870, 1.28870, 1.28870, 1.28870, 4, 4
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28870, 1.28871, 1.28871, 1.28871, 5, 5
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28870, 1.28870, 1.28870, 1.28870, 6, 6
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28870, 1.28870, 1.28870, 1.28871, 6, 7*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28870, 1.28870, 1.28870, 1.28870, 6, 8*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28868, 1.28868, 1.28868, 1.28868, 7, 9*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28866, 1.28866, 1.28866, 1.28868, 8, 10*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28866, 1.28866, 1.28866, 1.28869, 8, 11*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28866, 1.28867, 1.28867, 1.28870, 9, 12*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28866, 1.28867, 1.28867, 1.28868, 9, 13*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28866, 1.28866, 1.28866, 1.28868, 10, 14*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28865, 1.28865, 1.28865, 1.28868, 11, 15*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28865, 1.28866, 1.28866, 1.28868, 12, 16*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28865, 1.28867, 1.28867, 1.28868, 13, 17*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28865, 1.28866, 1.28866, 1.28868, 14, 18*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28865, 1.28866, 1.28866, 1.28866, 14, 19*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28864, 1.28864, 1.28864, 1.28866, 15, 20*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28864, 1.28864, 1.28864, 1.28865, 15, 21*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28863, 1.28863, 1.28863, 1.28865, 16, 22*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28863, 1.28863, 1.28863, 1.28866, 16, 23*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28863, 1.28864, 1.28864, 1.28866, 17, 24*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28863, 1.28864, 1.28864, 1.28865, 17, 25*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28863, 1.28863, 1.28863, 1.28865, 18, 26*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28862, 1.28862, 1.28862, 1.28865, 19, 27*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28862, 1.28862, 1.28862, 1.28864, 19, 28*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28862, 1.28862, 1.28862, 1.28862, 19, 29*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28861, 1.28861, 1.28861, 20, 30*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28865, 1.28865, 1.28866, 21, 31*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28864, 1.28864, 1.28866, 22, 32*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28866, 1.28866, 1.28866, 23, 33*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28864, 1.28864, 1.28866, 24, 34*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28865, 1.28865, 1.28866, 25, 35*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28864, 1.28864, 1.28866, 26, 36*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28866, 1.28866, 1.28866, 27, 37*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28867, 1.28867, 1.28869, 28, 38*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28872, 1.28872, 1.28872, 29, 39*
05/07/2013, 08:05:00, 1.28875, 1.28875, 1.28861, 1.28875, 1.28875, 1.28875, 30, 40*
05/07/2013, 08:05:00, 1.28875, 1.28876, 1.28861, 1.28876, 1.28876, 1.28876, 31, 41*
05/07/2013, 08:05:00, 1.28875, 1.28876, 1.28861, 1.28876, 1.28876, 1.28877, 31, 42*
05/07/2013, 08:05:00, 1.28875, 1.28876, 1.28861, 1.28876, 1.28876, 1.28878, 31, 43*
05/07/2013, 08:05:00, 1.28875, 1.28877, 1.28861, 1.28877, 1.28877, 1.28879, 32, 44*
05/07/2013, 08:05:00, 1.28875, 1.28879, 1.28861, 1.28879, 1.28879, 1.28880, 33, 45*
05/07/2013, 08:05:00, 1.28875, 1.28879, 1.28861, 1.28878, 1.28878, 1.28880, 34, 46*
05/07/2013, 08:05:00, 1.28875, 1.28879, 1.28861, 1.28876, 1.28876, 1.28878, 35, 47*
05/07/2013, 08:05:00, 1.28875, 1.28879, 1.28861, 1.28876, 1.28876, 1.28877, 35, 48*
05/07/2013, 08:05:00, 1.28875, 1.28879, 1.28861, 1.28875, 1.28875, 1.28877, 36, 49*
05/07/2013, 08:05:00, 1.28875, 1.28879, 1.28861, 1.28875, 1.28875, 1.28878, 36, 50*
05/07/2013, 08:05:00, 1.28875, 1.28879, 1.28861, 1.28876, 1.28876, 1.28878, 37, 51*
05/07/2013, 08:05:00, 1.28875, 1.28879, 1.28861, 1.28878, 1.28878, 1.28878, 38, 52*
05/07/2013, 08:05:00, 1.28875, 1.28881, 1.28861, 1.28881, 1.28881, 1.28881, 39, 53*
05/07/2013, 08:05:00, 1.28875, 1.28882, 1.28861, 1.28882, 1.28882, 1.28883, 40, 54*
05/07/2013, 08:05:00, 1.28875, 1.28882, 1.28861, 1.28882, 1.28882, 1.28882, 40, 55*
05/07/2013, 08:05:00, 1.28875, 1.28882, 1.28861, 1.28881, 1.28881, 1.28882, 41, 56*
05/07/2013, 08:05:00, 1.28875, 1.28882, 1.28861, 1.28881, 1.28881, 1.28883, 41, 57*
05/07/2013, 08:05:00, 1.28875, 1.28883, 1.28861, 1.28883, 1.28883, 1.28883, 42, 58*
05/07/2013, 08:05:00, 1.28875, 1.28886, 1.28861, 1.28886, 1.28886, 1.28886, 43, 59*
05/07/2013, 08:05:00, 1.28875, 1.28886, 1.28861, 1.28884, 1.28884, 1.28884, 44, 60*
05/07/2013, 08:05:00, 1.28875, 1.28886, 1.28861, 1.28884, 1.28884, 1.28886, 44, 61*
05/07/2013, 08:05:00, 1.28875, 1.28886, 1.28861, 1.28884, 1.28884, 1.28884, 44, 62*
05/07/2013, 08:05:00, 1.28875, 1.28886, 1.28861, 1.28883, 1.28883, 1.28884, 45, 63*
05/07/2013, 08:05:00, 1.28875, 1.28886, 1.28861, 1.28883, 1.28883, 1.28886, 45, 64*
05/07/2013, 08:05:00, 1.28875, 1.28886, 1.28861, 1.28884, 1.28884, 1.28886, 46, 65*
05/07/2013, 08:05:00, 1.28875, 1.28886, 1.28861, 1.28884, 1.28884, 1.28884, 46, 66*
05/07/2013, 08:06:00, 1.28883, 1.28883, 1.28883, 1.28883, 1.28883, 1.28884, 1, 1
05/07/2013, 08:06:00, 1.28883, 1.28883, 1.28883, 1.28883, 1.28883, 1.28886, 1, 1
05/07/2013, 08:06:00, 1.28883, 1.28884, 1.28883, 1.28884, 1.28884, 1.28886, 2, 2
05/07/2013, 08:06:00, 1.28883, 1.28884, 1.28883, 1.28884, 1.28884, 1.28887, 2, 3*
05/07/2013, 08:06:00, 1.28883, 1.28886, 1.28883, 1.28886, 1.28886, 1.28888, 3, 4*

The discrepancies are shown in the lines ending with a '*'. In this case OnTick() was called 66 times and the Tick Volume is only 46 for the 1-minute bar. The output also shows several lines with the same Tick Volume value indicating an unnecessary (?) OnTick() calls. The next bar is showing a similar problem. Please advise.

Thanks,
FlatLander