Apache modifies files owned by root
I have a very strange situation. I moved existing sites from an old Linux machine to a new one. Everything works fine except I noticed that Apache manages to modify files owned by root. The directory structure and the permissions are as follows:
-> my_site drwxr-xr-x
-> -> some_file -rw-r--r--
Everything is owned by root and the group is also root. Apache runs as user and group apache. The problem is that a php script manages to modify some_file. The things get even stranger because when I replicate the exact same directory structure with new files, the php script fails.
Thanks in advance for you advice.