Fisher producing diffrent results

Hi!

I really like the Fiher that the user atrade did, problem is thou that it produces diffrent results depending on how long it has been attached to the chart

http://spotware.ctrader.com/c/tSM5n

Anyone got a solution?

Code:

using System;
using cAlgo.API;

namespace cAlgo.Indicators
{
    [Indicator("Fisher")]
    public class Fisher : Indicator
    {
        private double _maxH;
        private double _minL;
        private bool _up = true;
        private double _current;
        private double _prev;
        private double _price;
        private double _value1;
        private double _fish1;

        [Output("Buffer0", PlotType = PlotType.Histogram, Color = Colors.Red)]
        public IndicatorDataSeries Buffer0 { get; set; }

        [Output("Buffer1", PlotType = PlotType.Histogram, Color = Colors.Green)]
        public IndicatorDataSeries Buffer1 { get; set; }

        [Output("Buffer2", PlotType = PlotType.Histogram, Color = Colors.Red)]
        public IndicatorDataSeries Buffer2 { get; set; }

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

        public override void Calculate(int index)
        {                      
            if(index < Period)
            {
                Buffer0[index] = 0;
                Buffer1[index] = 0;
                Buffer2[index] = 0;

                return;
            }

            //High[Highest(NULL, 0, MODE_HIGH, period, i)];
            _maxH = MarketSeries.High.Maximum(Period);
            //Low[Lowest(NULL, 0, MODE_LOW, period, i)];
            _minL = MarketSeries.Low.Minimum(Period);
            _price = (MarketSeries.High[index] + MarketSeries.Low[index]) / 2;
            
            double value = 0.33*2*((_price - _minL)/(_maxH - _minL) - 0.5) + 0.67*_value1;
            value = Math.Min(Math.Max(value, -0.999), 0.999);
            
            Buffer0[index] = 0.5 * Math.Log((1 + value) / (1 - value)) + 0.5 * _fish1;
            _value1 = value;
            _fish1 = Buffer0[index];

            _current = Buffer0[index];
            _prev = Buffer0[index-1];

            if (((_current < 0) && (_prev > 0)) || (_current < 0)) _up = false;
            if (((_current > 0) && (_prev < 0)) || (_current > 0)) _up = true;

            if (!_up)
            {
                Buffer2[index] = _current;
                Buffer1[index] = 0.0;
            }
            else
            {
                Buffer1[index] = _current;
                Buffer2[index] = 0.0;
            }
        }
    }
}