MT5 chart, historical data, MT5 Python plugin

[Rakinroul]

Hi i would like to ask metaquest developers ideally metatrader 5 programers about this twing: I am downloading history and making some analyses, but when i downloading, i mean saving all live data, all ticks - it doesnt matter they are unique or when i get them all or filter them by any rule, i am not able to make same or have same results as metrader 5 chart. How is that possible ?

Why is there difference between historical data, and live data?

Ohlc is usually correct, but in tick volume are big differences. Why and how is that possible.

I make analyses and testing, unfortunately nobody is able to get same data trhu MT5 Python plugin as metatrader 5 have - show on chart.

Is that on purpouse, or it is error ?

Thank you