Quantopian's community platform is shutting down. Please read this post for more information and download your code.
Back to Community
identical code, identical backtesting period, different outcome

hey everybody,

I just compared two back tests with identical code, identical periods but totally different outcomes.
I am wondering what this may be due to.
Has something changed regarding the backtesting data, Q500 universe or might there be a problem with my code?

Backtest 30 2018-02-05 2003-01-04 to 2018-01-01 Minute $10,000,000 83.55%
Backtest 5 2018-01-16 2003-01-04 to 2018-01-03 Minute $10,000,000 220.95%
The two backtests have identical code.*

Thanks in advance for your help or suggestions

Marcel