Confirming this bug:
Created a file on the server as user1, then opened the file via nautilus/ssh and gedit as user2. After saving the file, the file belonged to user2. In this scenario, the group was not changed - but when I used root as user2 (like the OP) both user and group were changed to root.
Confirming this bug:
Created a file on the server as user1, then opened the file via nautilus/ssh and gedit as user2. After saving the file, the file belonged to user2. In this scenario, the group was not changed - but when I used root as user2 (like the OP) both user and group were changed to root.