All markets are subject to Dead Heat rules, in the event of a tie or a draw for a position, the dividend will be calculated by the odds divided by the amount of selections tied for the position.
For example, If I had a bet on $10 for Jack Steele to finish top 5 at the odds of $1.50, my initial return will be $15. However, as Jack Steele & Darcy Parish tied for 5th (their finishing positions were 5th & 6th), the total payout is divided by 2. $15 divide by 2 = $7.50 which is what your return will be.