When syncing how do i control media
 

I have a hard time sorting out the syncing thing and one is with pictures. Sometimes it backups/syncs then copies pictures back to the BB that i do not want there. I have tried every setting in the BB software and phone but i am not getting anywhere.
I also noticed that everytime i use the usb cable for syncing or charging the wall paper picture reappears or disappears according to what the state was beforehand. Why does this happen? When it dissapears it goes back to the default theme