Changing timeframe causes indicator to "ghost"

[kstar]

Hi,

I'm looking for some help. I'm just starting out programming and I've used the widely available fractals.mq4 indicator as a base to play around with (https://www.mql5.com/en/code/7982). However, I've noticed that if I have the fractals indicator attached to a chart, something weird happens when I change timeframes - the indicator will plot, but then if you try to move the chart back in time it will plot extra points in a seemingly random pattern (pics below).

As I've used the fractals.mq4 as a base for other indicators, I'm getting the same issue on these too. Can anyone tell me what is going on please? I've checked the deinit code, and I'm getting REASON_CHARTCHANGE so I think that's functioning normally. I've also tried this on two different broker platforms and I get the same error.

Thanks in advance

Normal indicator:

Ghosted indicator:

[qjol]

by using iCustom() or iFractals() u dont need the indicator output on the chart at all

[William Roeder]

kstar: play around with (https://www.mql5.com/en/code/7982). Changing timeframe causes indicator to "ghost"

The indicator assumes that the buffers are set to empty like the documentation says. It never sets, non-fractal bars to zero. Mt4 bug.

   while(i>=2)
     {
ExtDownFractalsBuffer[i]=0; // Added
ExtUpFractalsBuffer[i]  =0; // code.

      //----Fractals up

[kstar]

qjol:
by using iCustom() or iFractals() u dont need the indicator output on the chart at all

Thanks qjol, I do indeed use iFractals() where I can, but I'd written my own indicators from this base. Thanks for the reply

[kstar]

WHRoeder:
The indicator assumes that the buffers are set to empty like the documentation says. It never sets, non-fractal bars to zero. Mt4 bug.

Thanks WHRoeder, you're a genius! That solved my issue instantly :)

I'll bear this bug in mind in the future