[tor-relays] Creating circuits to myself?

I was using arm when I noticed this line:

173.79.154.243 --> 173.79.154.243 (us) Purpose: Ags=is_internal,need_capacity, Circuit ID: 5 4.0m (CIRCUIT) That's my IP, and it showed the exit node as the same as my node. There are currently three circuits both originating *and* exiting at my node. I am using Tor 0.2.3.25 (recommended) on Windows 7. My fingerprint is 1E598CDB9BBC751D753146D880B326952886D73B