[tor-relays] 'service tor start' not using "/etc/tor/torrc"?

Hi, Today when I was using htop to check my Tor server. I found that Tor was running as "/usr/sbin/tor --defaults-torrc /usr/share/tor/tor-service-defaults-torrc --hush" which seems Tor is not using the configuration file "/etc/tor/torrc" but the default one instead. So what should I do to let Tor use /etc/tor/torrc? I tried to use "/usr/sbin/tor -f /etc/tor/torrc --hush" but it returned that 'debain-tor' is the owner of '/var/lib/tor' not the user I was using.

Tony.