FAQ: Why is my Analytics data duplicated? Follow

If you notice duplicated data in an Analytics report, you need to clear your web browser's cache. 

You can tell when duplicated data might appear if you see the green "Rerun Report" button. 

You must click the Rerun Report button to generate a report with accurate transaction data, as it will automatically clear data stored in your cache. The button will disappear once it no longer detects previously stored data in the browser's cache.