Date/Time?

After a fresh install of NFA 6, I suddenly see a strange data point:

Jul-29-07 17:36 12.3 Mbps
Jul-29-07 17:37 12.52 Mbps
Jul-29-07 17:38 9.06 Mbps
Jul-29-07 17:39 125.25 Kbps
Sep-17-07 08:35 17.60 bps
Sep-17-07 08:36 207.89 Kbps
Sep-17-07 08:37 961.51 Kbps

The first 4 points are valid, the last 3 not (obviously).

Any ides how they get there and how to get rid of?