"There was an error on one of the judge's scorecards that I picked up yesterday [Sunday].
"He made a mistake, the three rounds on the red side [Fakalelu] added up to 28."
Normally, the referee would give the scorecards an inspection before the final result was announced.
However, senior official Dave Hiroti, who had refereed all 12 fights on the card, aggravated a previous calf injury while moving around and was replaced after the first round of the main event. Alderton said the next two senior officials were already acting as judges.
The mid-match substitute had not made a close check afterwards.
"A couple of circumstances. I wished I picked it up but we were just looking at the final points tally.
"It's a terrible thing to happen but it happened and I've got to do something about it.
"Both parties have been informed and congrats to Aiden.
"I'm extremely sorry Aiden missed his moment of glory."
Despite the error, Alderton said the Rumble was a success before another packed house, which required extra seating to be brought out after the show began.
The highlight was the classic bout between teenagers Brayden Maua (Wanganui Warriors) and Earl-Jay Pehi (RTF Wanganui), with Maua claiming a close split decision.
The 16-year-old Maua said he knew he had the quicker hand speed and had put his cards on the table to go for it at the start of round two.