PlaceStopOrderAsync with SL and TP not exact values

Hi community

I am pretty new to cBot API and I was wondering why my orders do not close at the exact amount of pips as I set when placing the order...

I place a new StopOrder like this

PlaceStopOrderAsync(TradeType.Sell, Symbol, 20000, 1.13, "sellOrder1.13", 5, 20);

or

PlaceLimitOrderAsync(TradeType.Sell, Symbol, 20000, 1.13, "sellOrder1.13", 5, 20);

with StopLossPips=5 and a TakeProfitPips=20.

When I check the history, the positions get closed with a stop loss at not exact pips (e.g. -5.3, -5.2, -5.6) and at take profits like 20.4...
I do not understand the reason for this behavior.

Can somebody enlighten me here?

Thanks so much in advance.

Adrian