This isn't a bugged session but a session that didn't scan after x number of minutes.

Enemy Territory uses a lot of trickery throughout the code and one of the problems is a spontaneous disconnect.
It's something that players also experience and is as such also present in our server scanner.
If something weird happens then it simply can't query the server for the current stats and will try again the next time the server is scanned.

From time to time it happens that the server isn't scanned for a consecutive number of times.

Then the scores will only be calculated from the period of time in which the scans were successful.
Momentarily there is nothing we can do about this.