Same parameter but with difference test result

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I have do a back test with same parameter in two date. The first test was in end of Jan 2024, and the second in start of Jun 2024. I find that all of every parameter is same but the test result have very big difference, the old one is find and pass 5 years, but the new one was blown in 2020.

All of the EA parameters, spread, swaps and commissions are same without any changes. Please advise that why we got the big difference result in different test day.


Remark : The EA is based on Martingale strategy

 
Goal_EA: Remark : The EA is based on Martingale strategy

Martingale is not a strategy. It's a betting system.

Hedging, grid trading, same as Martingale.
          Martingale, Hedging and Grid : MHG - General - MQL5 programming forum (2016)

Martingale, guaranteed to blow your account eventually. If your strategy is not profitable without, it is definitely not profitable with.
          Martingale vs. Non Martingale (Simplified RoR vs Profit and the Illusions) - MQL5 programming forum (2015)

Why it won't work:
          Calculate Loss from Lot Pips - MQL5 programming forum (2017)
          THIS Trading Strategy is a LIE... I took 100,000 TRADES with the Martingale Strategy - YouTube (2020)

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