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There are known issues that I do not think have been resolved yet with the way the Google Analytics Report API and Tableau communicate. The issue is on the Google side, as I understand it, and there is nothing you can do to fix it. That MAY be what you are seeing.
Other potential issues are that sometimes the way Google counts things internally is NOT possible externally, as the API does not expose exactly the same data to a 3rd-party toolset. Very hard to say if that is your issue without digging into the raw data, but I've experienced issues getting counts to match consistently.