I think the the language on the ticket is misleading but you are guilty of not stopping.
I know being stuck behind a school can be very frustrating! I have actually blown at school busses that were stopped for too long. Parents shouldn't be holding up traffic in the morning by having lengthy conversations with their kids or the driver. grrrrrrr
But yeah, you are definitely guilty of at least one infraction (not stopping).
3b (with 3c tendencies) on modified CG