The multicurrencies indicator doesn't draw and works fine in mql4 - mql4

Question

I wrote a mql4 multi-currency indicator (later I'll do it in mql5) which plots 8 buffers, 1 for each currency (AUD, CAD, etc...). The resulting value is then passed with a double smoothing (like the TSI indicator), basically I'm trying to reproduce the FOTSI indicator (here the Tradingview code https://it.tradingview.com/script/xjLnpOze/).
The problems I encounter are:
if I load the indicator on two different charts (e.g. EURUSD and GBPAUD) it draws differently even though there is nothing in the code that recalls the symbol of the chart it runs on.
if I update the graph after n bars (right mouse button) the indicator changes values and redraws itself. It is not a repainting in bad faith but evidently recharges the new values.
if I try to do the backtest with visualization, the indicator goes bust, i.e. it draws badly and goes haywire... even without visualization, when the backtest ends and it plots itself on the graph, it is slightly different from the one on the demo.
In the MT4 platform I only have the H1 data (all other timeframes empty) for all 28 symbols and it is disconnected from the internet, each bar takes the closing values from the 7 charts involved (EUR from EURAUD, EURCAD, EURCHF, etc.. ...).
I also thought about the asynchronous receipt of ticks, i.e. when the tick arrives on the main chart (where the indicator runs) it may not have arrived on some of the other charts so incorrect values are created which are fixed upon updating, right? But I can't figure out if that's the problem...
Maybe it's better to run the calculations only when all the charts have changed the bar then take the close[1]?
Here part of the code (only for AUD), the formula function calculats value Close[i] - Open [i] and I have different formulas.
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 i, total;
total = prev_calculated == 0 ? rates_total - 1 : rates_total - prev_calculated;
//---- AUD
for(i = total; i >= 0; i--)
{
mtmAUD[i] = formula(formulas, currencies[0], i);
mtmAbsAUD[i] = MathAbs(mtmAUD[i]);
smooth1AUD[i] = iMAOnArray(mtmAUD, 0, firstR, 0, MODE_EMA, i);
smoothAbs1AUD[i] = iMAOnArray(mtmAbsAUD, 0, firstR, 0, MODE_EMA, i);
smooth2AUD[i] = iMAOnArray(smooth1AUD, 0, (uchar)MathFloor(firstR / divPeriod), 0, MODE_EMA, i);
smoothAbs2AUD[i] = iMAOnArray(smoothAbs1AUD, 0, (uchar)MathFloor(firstR / divPeriod), 0, MODE_EMA, i);
if(smoothAbs2AUD[i] == 0)
{
Print("Zero divide of 2nd smoothing at index: #" + (string)i);
continue;
}
aud[i] = 100 * smooth2AUD[i] / smoothAbs2AUD[i];
}
Image attached shows the indicator (only with AUD plotted) which is different on two charts.
I've tryed on demo and backtest but nada... :-(