Yes, the MinTradeResult with this script must indeed be -100 $. At least when I run your script:

MinTradeResult: -104.332444
MaxTradeResult: 101.864881

Profit -47$ MI -2$ DD 193$ Capital 238$
Trades 184 Win 48.9% Avg -3.0p Bars 2
AR -9% PF 0.94 SR -0.32 UI 89% R2 0.00

Look in the log for the trade that generated the -300$ in your test. This way you can quickly find the answer to such issues. Could be a large gap in the price data.