New folders appears on client FTP domain

[hardbrasil]

Hi fellas, recently and i dont know why... become to appears a lot of new folders inside of FTP domain account.
i ask data center support and he said that none of them make changes on Plesk.

im using Plesk 8.6

please see the printscreen:
http://www.next4.com.br/extra/plesk_folders.jpg

i would like to show to my clients only the essential folders.

thanks advanced.