I downloaded data March 14 on one computer from IQFeed and then March 15 from a different computer, those data are different, even some days are missing, I used the same 4.8 client, what is the problem? Chart data are different, resulting in different backtest results.
You can see different filesizes and even missing days in the attached screenshot. It is the case of ES ##-## and also CL ##-##, did not check other contracts.
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