After receiving a call on my Pre this afternoon, I looked at my call log to add the number to my contacts. The call log showed 2 calls from that number; I tapped the arrow to view the calls to see if I had missed a call previously.

What I saw was 2 separate entries for the same number incoming at the exact same time (13:55), one showed a duration of 6 min 20 sec and the other a duration of 6 min 18 sec.

What would cause the call log to display a single incoming call in that manner?