Not poor QC. This stuff happens. It has happened to me after loading my own shells. I take a lot of time crimping my loads and leave the press down for 15 mins before moving the shell, then leave the shell sit for several days before putting it in the box. Then I seal with Alex Plus. I had one open completely this past year, but 9 others that didn't. That is 10%, but it happens. These are new hulls and are stiff.