Dr.Kim,
I have never had this problem so I can't offer a solution. I trust you've asked Tech Support if they have any solution?
When you open a chart on your desktop, do you select "yes" or "no" to the question: do you want to remove the selected item from your desktop?; you are presumably selecting "yes" and you should do so if you are not. If you are not, this will create multiple versions of the note you are working on to appear on the desktop.
