it's really a great bug based on balance. The chart of growth looks great for lots of traders using strategy of very small size and without stop loss. They take advantage of this bug as the chart does mislead for freshman.
all should be calculated based on equity.
After looking at the equity analysis of my own signal I also observed that MQL5 appears to only analyse equity from the date a given account is connected to the signal service. I suppose equity information is not available further back than that.
see this signal icon, continuously up almost without drawback and also it's growth chart.
but if you see equity chart, the real growth is another looking, with maximum dd of 45%, that is misleading.
The final result is very good. But the risk is totally different between growth chart and equity chart.
this is a system problem, not someone.