AHH!! I can see what's going on now. Because I'm dutching horses with chances totalling 15%, in Caulfield R4 I have dutched 3 horses with divs of $17, $19, $190 which results in a payout of $756.
You're dutching any horse $20 plus so there's only one horse in that race that qualifies and it's "Primitive Man" @ $190, so you get a payout of $1,600 for that race.
I'll go back over the other races now and recheck.
Cheers RP