I kind of have the same problem with my RCBS hand primer that I got with my kit too.
I find that what helps for me is by playing around that white plastic piece thingy and the shell holder. I find that pushing that white piece thingy all the way in and turning the shell holder so that the open end is facing the primer tray works the best for me. Turn it while looking down where the primer come up and you can see if its centered or not.
I think its a design flaw and not the cases.
Yes I was noticing the same issue. Certainly seems like a design flaw but I'll continue playing around with it to see if I can get it to work.


















































