I have a Classic turret and don't have that problem. I wonder if there is a chance they put a index rod from a three hole press on your four hole press. I would call Lee and see what they have to say. The seating and sizing dies are totally different. the sizing die has a small stem that sticks out of the bottom for pushing the primer out of the case and the seating die doesn't.
These are your dies from left to right. 1) sizing die 2) powder die 3) seating 4) factory crimp die.
Rusty