Crazyhops must be on to something. Maybe there was a huge puddle on the part of the apron used by left-footed jumpers, but no problem on the other side. So the only two right-footed jumpers cleared the height. LOL.
I think you are both on to something. If my memory serves me correctly, the steeple chase pit is on the right side of that apron and water typically collects around that area of the track. It might have even spilled into some of the inside lanes by the start of the 200.