If you have multiple rounds added for 1 course but added to different scorecards this may affect some of the course based analysis.
To check for duplicates simply access the score tracker via the My Game section. Click on Rounds and then click on the heading for 'by Course'. This will list all your rounds for each individual tee/scorecard as below.
To change and update a score simply edit the round. You are then able to select the correct tee/scorecard from the dropdown list. The scorecards will list when a round was last played and if that scorecard is ive or archived.