I am trying to make changes to my website over ftp but when I save any files it changes the permissions and owner to my username. I can edit files in the same folder trough samba without changing the permissions. I really don't understand how the permissions for the /var/www folder work and I'm pulling my hair out trying to get it to work. I have recently made changes to the permissions of the /var/www directory (following this guide) so I could modify files in the www root. Right now I have the entire contents of /var/www set as -rwxrwxr-x 1 www-data www-data but when I change a file over ftp it becomes -rw------- 1 akbkuku akbkuku, akbkuku being my username. I am using vsftpd as the server, and I login with my normal user.

How do I make it leave to permissions alone?

At this point I'll even take a way yo reset all the permission back to stock and I'll just never modify files in the web root.