Anything that puts a lot of pressure on the hull can cause the brass to bend or dish. Way the problem sounds and without looking at it, if dished the primer seating stem is probably too high. Or if the hull is bowed out Primer punch could be responsible, running too deep punch the primer and going to far.
I get suspicious if the press takes too much effort to operate, lot of leverage you can push hard, but should not have to.
William
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