At start up, the horse should buck 5 times. Each time the Ball Count Unit steps up to get to ball 5.
But anyways, it sounds as though maybe the set of contacts in the 1-9 (1s) Relay that activates
the score reel could be too close together, thus slightly making contact for each buck. Also the
set of contacts that hold that Relay could be to close. I'd say worth checking the contact's caps
in the 1s Score Relay..