MQL5 Heikin Ashi RSI Oscillator: error plotting candles - trading

Question

I was trying to convert this indicator from TradingView to MQL5 but it badly prints the candles, as in the attached photo, and i don't understand where is the problem.
From the TradingView indicator i want to convert only the Heiken Ashi code, not RSI and Stoch lines.
Here there is the code:
//+------------------------------------------------------------------+
//| Heiken_Ashi_RSI_Oscillator.mq5 |
//| Copyright 2009-2020, MetaQuotes Software Corp. |
//| http://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "2009-2020, MetaQuotes Software Corp."
#property link "http://www.mql5.com"
//--- indicator settings
#property indicator_separate_window
#property indicator_buffers 5
#property indicator_plots 1
#property indicator_type1 DRAW_COLOR_CANDLES
#property indicator_color1 DodgerBlue, Red
#property indicator_label1 "Heiken Ashi Open;Heiken Ashi High;Heiken Ashi Low;Heiken Ashi Close"
//--- indicator buffers
double ExtOBuffer[];
double ExtHBuffer[];
double ExtLBuffer[];
double ExtCBuffer[];
double ExtColorBuffer[];
input int periodoRSI=14;
input int smoothRSI=1;
int handle_harsi_close,handle_harsi_open,handle_harsi_low,handle_harsi_high;
//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+
double HA_RSI_CLOSE(int shift)
{
double value[];
if(handle_harsi_close!=INVALID_HANDLE)
{
if(CopyBuffer(handle_harsi_close,0,shift,1,value)>0)
return(value[0]);
}
return(WRONG_VALUE);
}
//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+
double HA_RSI_OPEN(int shift)
{
double value[];
if(handle_harsi_close!=INVALID_HANDLE)
{
if(CopyBuffer(handle_harsi_open,0,shift,1,value)>0)
return(value[0]);
}
return(WRONG_VALUE);
}
//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+
double HA_RSI_HIGH(int shift)
{
double value[];
if(handle_harsi_close!=INVALID_HANDLE)
{
if(CopyBuffer(handle_harsi_high,0,shift,1,value)>0)
return(value[0]);
}
return(WRONG_VALUE);
}
//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+
double HA_RSI_LOW(int shift)
{
double value[];
if(handle_harsi_close!=INVALID_HANDLE)
{
if(CopyBuffer(handle_harsi_low,0,shift,1,value)>0)
return(value[0]);
}
return(WRONG_VALUE);
}
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
void OnInit()
{
handle_harsi_close=iRSI(_Symbol,PERIOD_CURRENT,periodoRSI,PRICE_CLOSE);
handle_harsi_open=iRSI(_Symbol,PERIOD_CURRENT,periodoRSI,PRICE_OPEN);
handle_harsi_high=iRSI(_Symbol,PERIOD_CURRENT,periodoRSI,PRICE_HIGH);
handle_harsi_low=iRSI(_Symbol,PERIOD_CURRENT,periodoRSI,PRICE_LOW);
//--- indicator buffers mapping
SetIndexBuffer(0,ExtOBuffer,INDICATOR_DATA);
SetIndexBuffer(1,ExtHBuffer,INDICATOR_DATA);
SetIndexBuffer(2,ExtLBuffer,INDICATOR_DATA);
SetIndexBuffer(3,ExtCBuffer,INDICATOR_DATA);
SetIndexBuffer(4,ExtColorBuffer,INDICATOR_COLOR_INDEX);
//---
IndicatorSetInteger(INDICATOR_DIGITS,_Digits);
//--- sets first bar from what index will be drawn
IndicatorSetString(INDICATOR_SHORTNAME,"Heiken Ashi RSI Oscillator");
//--- sets drawing line empty value
PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0.0);
}
//+------------------------------------------------------------------+
//| Heiken Ashi |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
const int prev_calculated,
const datetime &time[],
const double &open[],
const double &high[],
const double &low[],
const double &close[],
const long &tick_volume[],
const long &volume[],
const int &spread[])
{
int start;
//--- preliminary calculations
if(prev_calculated==0)
{
ExtLBuffer[0]=low[0];
ExtHBuffer[0]=high[0];
ExtOBuffer[0]=open[0];
ExtCBuffer[0]=close[0];
start=1;
}
else
start=prev_calculated-1;
//--- the main loop of calculations
for(int i=start; i<rates_total && !IsStopped(); i++)
{
double _closeRSI = HA_RSI_CLOSE(0);
double _openRSI = HA_RSI_CLOSE(1);
double _highRSI_raw = HA_RSI_HIGH(0);
double _lowRSI_raw = HA_RSI_LOW(0);
double _highRSI = MathMax(_highRSI_raw, _lowRSI_raw);
double _lowRSI = MathMin(_highRSI_raw, _lowRSI_raw);
double _close = (_openRSI + _highRSI + _lowRSI + _closeRSI) / 4;
double _open = (_openRSI + _closeRSI) / 2;
double _high = MathMax(_highRSI, MathMax(_open, _close));
double _low = MathMin(_lowRSI, MathMin(_open, _close));
ExtLBuffer[i]=_low;
ExtHBuffer[i]=_high;
ExtOBuffer[i]=_open;
ExtCBuffer[i]=_close;
//--- set candle color
if(_open<_close)
ExtColorBuffer[i]=0.0; // set color DodgerBlue
else
ExtColorBuffer[i]=1.0; // set color Red
}
//---
return(rates_total);
}
//+------------------------------------------------------------------+
THANK YOU!