Kev, just ignore him.
Check this thread out: http://community.wd.com/t5/WD-My-Cloud/Don-t-feed-the-Troll-Be-forewarned/m-p/715204#U715204
Eli is one those folks (if not actually the same person who has registered at least 50+ different user IDs)
Unfortunately, since I don’t have a PS3, there’s not much I can do to test / help out.
But if you browse the DLNA server manually (http://ip address of your NAS:9000) and do not see duplicates there, nor see duplicates when you browse using DLNA from other systems, I can’t help but think it’s an issue specific to the PS3?