Check the 'open at top' switches on each score unit. If they are open, this behavior could, possibly, be happening.

Another possibility is that switch stack 7 on the control unit has been mangled.

@baldtwit would likely have a better idea - in my mind neither of these things could happen and prevent the second and third steps of the odds - the open limit switch would get the game stuck in reset, I'd wager. The mangled switch stack 7 would prevent initial stepping of the odds units.

Is the game tilted, by any chance?

Upon second reading, double check the limit switches on each of your score units. It sounds like it is not making the initial step either?

Agreed @okorange. I (probably incorrectly) ruled that out because it sounded like his odds were stepping once. But then I re-read and I wasn't sure. The switch stack 7 seems most logical to me, but it totally depends on if they are stepping once or not.