Snafu in counting the votes?

Checking the results page at 5:50pm, 50 minutes after they promised the preliminary results would be up yields the following note:

Please note: Preliminary Christchurch City Council election results will be available as soon as they are received. In the meantime, it would be appreciated if candidates and other interested parties could be patient, and refrain from telephoning the electoral officer.

The last sentence makes it sound as if they are cracking under pressure.

UPDATE: It is now 9:05pm and there are still no results. The vote-counters are useless.