MA of different time frame is not displayed

MA of different time frame is not displayed as in the below image.

What is wrong?

This is my code.

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

namespace cAlgo
{
    [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class testMA : Indicator
    {

        [Parameter("Color", DefaultValue = "Blue")]
        public string color { get; set; }

        [Parameter("MA Type", DefaultValue = MovingAverageType.Simple)]
        public MovingAverageType maType { get; set; }

        [Parameter("Period", DefaultValue = 10, MinValue = 1)]
        public int _Period { get; set; }

        [Parameter("Time Frame MA", DefaultValue = "Minute15")]
        public TimeFrame timeFrame { get; set; }

        [Output("ma", LineColor = "Green", PlotType = PlotType.Line, Thickness = 1)]
        public IndicatorDataSeries MA { get; set; }

        public Bars _Series;

        public MovingAverage _MA;

        protected override void Initialize()
        {
            if (timeFrame == Bars.TimeFrame)
            {
                _Series = Bars;


                _MA = Indicators.MovingAverage(Bars.ClosePrices, _Period, maType);
            }
            else
            {
                _Series = MarketData.GetBars(timeFrame);

                _MA = Indicators.MovingAverage(_Series.ClosePrices, _Period, maType);
            }
        }

        public override void Calculate(int index)
        {

            var _Index = _Series.OpenTimes.GetIndexByTime(Bars.OpenTimes[index]);

            if (_Index == -1)
            {
                return;
            }
            if (Bars.OpenTimes[index] == _Series.OpenTimes[_Index])
            {

                MA[index] = _MA.Result[_Index];
            }

        }
    }
}