Inconsistent Back Testing

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I am fairly new to trading and MT4, so I may be making a very silly mistake. The problem that I am having is that I code an EA and then I back test it. Then if I shut down my PC and come back the next day, and I back test the EA over the same period on the same symbol, I get completely different results. I am keeping the spread at 50, I keep the period at M5, I test on the same symbol, I test over the same dates, I use the same EA, but I get different results. This makes no sense to me. Does anyone know why this might be happening and how I might be able to fix this?
 

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Alain Verleyen, 2023.03.28 20:04

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Kianoush Mohebbi:
I am fairly new to trading and MT4, so I may be making a very silly mistake. The problem that I am having is that I code an EA and then I back test it. Then if I shut down my PC and come back the next day, and I back test the EA over the same period on the same symbol, I get completely different results. I am keeping the spread at 50, I keep the period at M5, I test on the same symbol, I test over the same dates, I use the same EA, but I get different results. This makes no sense to me. Does anyone know why this might be happening and how I might be able to fix this?
Do you choose same modelling every time? By modelling i mean tick based, open price only...
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