Different output for the same query!

I'm running a simple query on AdWords API and get different result every time I run it! Looks like Google just use some sort of random generator to create this report.

See the data for the same date.

What I'm querying is 'Date','Clicks','Cost', 'HourOfDay', 'DayOfWeek','Ctr', 'Device' on "ACCOUNT_PERFORMANCE_REPORT" How's that possible?!?!?!

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