Hi
Google Analytics connector in Power BI Desktop rely on the Google Analytics Core Reporting API. Due to this dependency we cannot guarantee the results of your queries when using this connector. See: Google Analytics connector for Power BI Desktop.
In your scenario, please try to update the desktop to latest version 2.44.4675.422. Also please verify Google Analytics Reporting API results during Month March (01.03.2017 - 06.03.2017). For more information about using this API, you can post a thread here as suggested from this article.
Best Regards,
Qiuyun Yu