It is my guess you have iTunes option set to yes to import into. So you are getting two copies of each because iTunes is copying each one that is downloaded. And you are sharing a portion at least of your iTunes Music Library.

Personally I only share particular portions of my iTunes library such as particular albums or artists because my iTunes library is so large. (I still share almost 10,000 files however.)

Hi LR

If thats the case could you guide me through to preferences to modify the setting so i can solve the issue?