Swingn It, a 6-1 chance, unseated jockey Jorge Velez shortly after the start of Saturday's second race, a $20,000 claimer for maiden fillies and mares.
Velez was quickly on his feet. Swingn It ran with the field, causing no interference, but proved difficult to catch for outriders in the minutes after the race.
There were only five runners and four finishers. The stewards conducted an inquiry and after eight minutes disqualified Grey Tsunami from fourth and listed her as officially unplaced, meaning there were only three official finishers.
The race was won by Remember to Smile ($3.40).