Right at the start of the finale, they showed the graph of where the voting sat. Then they put faces/names on the percentages.
It caused such a massive influx of votes that things melted, they couldn't keep up and the finale ended up running over an hour longer than planned because they legitimately couldn't work out who the winner was. Poor Gretel was up on the stage treading water for close to an hour, then they eventually pulled both finalists out of the house and ran both versions of the end of the finale they had planned (interview/showing video packages etc). And by the time they finally had the result, they announced it and then the show pretty much ended immediately.
Then it ended up being Gretel's last show and she went out on a massive low.