#0 - Dec. 14, 2007, 6:28 p.m.
Blizzard Post
There is a difference between the honour really won and the estimated honour gain in the PvP tab of your character window. This difference is due to a display problem. The honour won is the correct amount. The estimated honour display tends to show a higher value for these several reasons.

Additional information here : http://forums.wow-europe.com/thread.html?topicId=1829144110&sid=1#2