Owner permissions on new files

Hi UCS forum reader.

Since some days we have a strange behaviour when new files are being created.
Normaly when a file is being created the owner is the user itself. The group owner is normaly the group which is the primary group from this user.
But in our case the group owner is alway “Domain Users”, which is not the primary group of the user.

I have this issue in an UCS 4.4.8 environment.
On an older installation with UCS 4.4-4 we have the expected behaviour (the primary group is the owner of the file), so I assume this was shipped with an update.

Is there any possibility to change this behaviour back?

Just for the info: This has nothing to do with some special samba share setting, since I tested it on the CLI in the /tmp folder.

Kind regards
Basti