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why do I get different back-testing results with all the same setting(EA, date range, all parameters, etc.) I'm going crazy

I test 4 times, I got 4 different result as follow: First test: second test: Third test: Forth test, fifth, sixth....... : , and it fix on the result, but when I close the MT4 app and run again, the result change to the figure no.1 again. I'm going crazy. who can help me please:)