Why are scheduling assigning SC before rotations available to pick up two days ahead?

SC for next day are being assigned before noon and rotations two days ahead at 1pm. It really screwed me up trying to get a YS two days ahead. Ended up getting SC, while a JR pilot got a rotation assigned that I wanted. Yes, I was the senior pilot…

After talking with CS, I weed up doing an Alpa Ticket.