Hi Wez,
In the particular market that you referred to above (the 14:40 Plump on the 1st of December), the trigger placed a bet correctly. What is indeed incorrect is the form variable displayed in the Engineer view. You covered this issue in another topic, so I won't comment it here. The important thing is that the Form of Maccabees was 4986-65, therefore it was not ending with either 1 or 2.
Please see the attached screenshot where that selection's form is displayed in a separate window. I used Time Machine to recreate this race.