Hellow guys, thanks for your answers. It’s like l’Andorrà says, the value of highs and lows is following an apparently incoherent sequence.

Helow,
This simple bot buys when the price breaks the resistance defined by the last high (constant high = 1, configurable) of the zigzag indicagtor. And sells when the price breaks the support defined by the last low (constant low = 1, configurable) of the zigzag indicator. Well, backtesting the bot in visual mode, you can see that sometimes the bot buys/sells with the break of the last high/low (correct), but other times, the bot buys/sells with the break of the penultimate high/low (incorrect).

https://fxdreema.com/shared/AdKkfxrdb