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I'm wondering if the chamber is cut to big in diameter? If so, the case is expanding in every direction and slamming backwards when firing from the "slop" could be the issue as well. I never ran into an issue like yours unless I was loaded hot becuase my 13 year old digital RCBS scale went of the blink.  The only other time was my first go at sizing the 35 Rem in my 336. I adjusted my FL sizer to far down and I had light primer strikes. I also had a few primers sitting proud. I bought a Hornady comparator and a hand held rcbs primer installer. I measured the fired case necks and bumped back 2 thousands. My flat primers that looked like they were over pressured were no more. What was causing my flattened primers imo was I bumped my case necks back to far and they were slamming backwards when firing. My buddy is shooting someone's hand loads from an estate sale. They were blowing primers like yours. I pulled a few to find out that they were loaded below minimum load data with the powder charge that was listed on the box. Also his case necks were bumped WAY back. That's why I don't shoot other peoples hand loads. Come to think of it I have blown primers on worn out brass with less than desirable primer pocket searing pressure. Almost like they could be pushed in by hand.