Blizzard posted information about a delay in the Honor calculations on a number of North American servers. If you are into PvP you should check it out.

The honor calculations during the weekly maintenance today were not completed for the realms listed below. We are currently in the process of recalculating the data that was left out. During this recalculation process players may notice shifting or changing 'Today' and 'Yesterday' values, we expect the calculations to complete and these figures to finalize sometime late tonight.

You can read the whole thread and the list of servers affected here: Honor Calculations.