Renko - cBot dont get all Bars

I have a very simple script that should number each Renko Bars (because I need a certain value from them).
However, some renko Bars are not numbered. Does anyone have an idea why? 
(See Image)
Using Ctrader 5.0.20 MAC

For Example here is the 11180 missing
And here is the simple code:
US30 RE20

 

using cAlgo.API;
using cAlgo.API.Internals;
using System;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class SimpleRenkoColorNumber : Robot
    {
        [Parameter("Renko Block Size (Pips)", DefaultValue = 10)]
        public int RenkoBlockSize { get; set; }

        [Parameter("Left Shift (Bars)", DefaultValue = 1)]
        public int LeftShift { get; set; }

        private double _renkoStartPrice;
        private int _barCounter;

        protected override void OnStart()
        {
            _renkoStartPrice = Bars.ClosePrices.Last(1);
            _barCounter = 0;
        }

        protected override void OnBarClosed()
        {
            double currentPrice = Bars.ClosePrices.Last(1);
            double priceMovement = currentPrice - _renkoStartPrice;

            if (Math.Abs(priceMovement) >= RenkoBlockSize * Symbol.PipSize)
            {
                bool isBullish = priceMovement > 0;
                DrawBlock(isBullish ? Color.Green : Color.Red, _barCounter);
                DrawBarNumber(_barCounter);

                _barCounter++;
                _renkoStartPrice = currentPrice;
            }
        }

        private void DrawBlock(Color color, int blockNumber)
        {
            string objectName = "RenkoBlock_" + blockNumber;
            DateTime shiftedTime = GetShiftedTime(LeftShift);
            Chart.DrawIcon(objectName, ChartIconType.Square, shiftedTime, Bars.ClosePrices.Last(1), color);
        }

        private void DrawBarNumber(int barNumber)
        {
            string textName = "BarNumber_" + barNumber;
            string text = barNumber.ToString();
            DateTime shiftedTime = GetShiftedTime(LeftShift);
            Chart.DrawText(textName, text, shiftedTime, Bars.ClosePrices.Last(1), Color.White);
        }

        private DateTime GetShiftedTime(int shift)
        {
            int index = Math.Max(0, Bars.Count - 1 - shift);
            return Bars.OpenTimes[index];
        }
    }
}