networkshare foreign folder shows as "my documents" ????

Hello,

i have kind of a weird behaviour here, seems connected to windows 7, maybe
vista too:
we have a EMC Celerra fileserver for our Homes (shouldnt make a difference) :
all userhomes are on one share, users may only write to their homes, and are
not allowed to view the contents of the share, only their own subfolder.
now a user put his "my documents" directly into his home.
I, and a colleaque, as domain admins, looking at the root of the share see
all the username's folders, and that users folder is named "my documents" ????
To clarify: those arent "my documents" !!!
looking at the ufs filesystem of the linux based celerra, i can see no file
like desktop.ini or else at the to of the share where the user-folders are.
HOW the hell would my windows 7 and colleaques windows XP come to show me
that particular users folder as "my documents"

any insight would be great. i am just thinking of more users putting their
"my documents" there and we, as admins , see only
my documents
my documents
my documents
my documents