It was discussed on the Russian forum some time ago with MetaQuotes admins, and it was the following comclusion: it is the bug in the EA.
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and the errors in the EAs were the reasons the different results of backtesting.

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I 've found problem while optimizing.
MetaTrader5.
I optimized my EA and select some result for back test.
But back test result is different.
What is the problem?
I 'm using custom indicator.
I uploaded cases.
I changed code simply.