Admin, owner of folder cannot modify folder and file in it

Hi,
i've created a shared folder on Mac OS X Server.
I'm the admin of Server.
I've enabled me and other users to read/write in that shared folder.
Now a subfolder (and file) created by other users sunder that main shared folder are READ-ONLY to me (and only to me) while all the other local network users can read and WRITE those subfolders/files.
Why ???
The odd is that if i click on these items the owner is ... me !!!
Any hints ?
Thanks

Now i see it, thanks.
It's odd: i see near to all users the disclosure triangle while me (owner) not has any disclosure triangle.
I've added again my name and now disclosure triangle is avaible and i can setup also me ...
But now i've 2 me users, one with disclosure triangle and one not ...
I've also tried to change the me owner (wit no disclosure triangle)  (not in ACL panel) to leave only assigning the shared panel to me (with disclosure triangle) but when modify it all other users disappear ...
hoping it's clear

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