I too load on a Pro-2000 using CCI primers and RCBS dies and have never had a problem with this. All I can think of is maybe there's something funky with the decapping pin in that particalar die your having trouble with. (If it's only one die that is).
I don't chamfer the primer pockets much on my brass either, maybe that's the difference? I don't always hear the spent primer fall, but never has a hanging primer stopped me from rotating the shell plate, or in the seating of a new primer. Try calling RCBS if nothing else makes sense.