indicator not working as expected

I have a multi-timeframe pinescript momentum oscillator indicator in tradingview which has the following code , it is supposed to draw a histogram which has a red color if <0 and a green color if >0 , it works well in tradingview but not with ctrader as the shape and indicator values are not the same :

//@version=5
indicator(title="Momentum oscillator copy 2", shorttitle="Mom oscillator copy 2", timeframe="", timeframe_gaps=true)
lengthInput = input.int(9, title="Length")
tf=input.timeframe(title="Timeframe 5 mins",defval="5")
hull9open  = ta.hma(open , lengthInput)
hull9open5mins=request.security(syminfo.tickerid,tf,hull9open,gaps=barmerge.gaps_on)
momhull9open = hull9open-hull9open[1]
momhull9open5mins = hull9open5mins-hull9open5mins[1]
osc = momhull9open+momhull9open5mins
plot(osc , color = osc>0? color.green : color.red , title = "osc" , style = plot.style_columns)

I tried writing the same indicator for ctrader using the following code : 

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

namespace cAlgo
{
    [Indicator(AccessRights = AccessRights.None)]
    public class MomentumOscillator : Indicator
    {
        // Declare the necessary parameters and outputs
        [Output("Oscillator", LineColor = "Red")]
        public IndicatorDataSeries Oscillator { get; set; }

        private HullMovingAverage hma9_1Hour;
        private HullMovingAverage hma9_5Min;

        protected override void Initialize()
        {
            // Initialize Hull Moving Averages for 1-hour and 5-minute timeframes using the open prices
            hma9_1Hour = Indicators.HullMovingAverage(Bars.OpenPrices, 9);  // Access the open prices directly (no method call needed)
            hma9_5Min = Indicators.HullMovingAverage(Bars.OpenPrices, 9);  // Access the open prices directly (no method call needed)
        }

        public override void Calculate(int index)
        {
            // Ensure we don't go out of bounds (check index)
            if (index <= 0)
                return;

            // Calculate the momentum for the 1-hour timeframe (subtract current value from previous)
            double currentHMA1Hour = hma9_1Hour.Result[index];
            double prevHMA1Hour = hma9_1Hour.Result[index - 1];
            double momentum1Hour = currentHMA1Hour - prevHMA1Hour;

            // Calculate the momentum for the 5-minute timeframe (subtract current value from previous)
            double currentHMA5Min = hma9_5Min.Result[index];
            double prevHMA5Min = hma9_5Min.Result[index - 1];
            double momentum5Min = currentHMA5Min - prevHMA5Min;

            // Calculate the sum of both momenta
            double oscillatorValue = momentum1Hour + momentum5Min;

            // Store the oscillator value in the output series
            Oscillator[index] = oscillatorValue;
        }
    }
}

How can i plot the same indicator as tradingview with the same shape & values ?