As Bullsbrook took the lead with about 10 minutes to go, a red card was issued to a Saints player. In the confusion, the player was illegally replaced on the field.
With five minutes to go, the Wundowie bench called for a head count. For having one too many Saints players, its entire score was wiped clean.
The final amended score was Wundowie 7.14 (56) to Bullsbrook 1.1 (7).
Earlier, a first quarter jump by the Warriors allowed them to grab the lead and kick away to a four goal advantage by half time.
The Saints did not lie down and fought hard in the third quarter to come in at three quarter time less than a goal down.
The last quarter was played at a frantic pace, with the Saints claiming the lead with about 10 minutes to go before the red card incident ended its hopes.
The Saints lost the match but not from a lack of effort.
They will travel up to Gidgegannup this weekend in an attempt to make amends.
In other games, Chidlow was given a run for its money by Pickering Brook to emerge a 10-point winner. Final scores were Chidlow 14.14 (98) to Pickering Brook 13.10 (88).
Gidgegannup easily accounted for Forrestfield, 31.15 (201) to 3.2 (20) and Mundaring beat Mt Helena 21.18 (144) to 12.8 (80).