Well... You said this is the first time you have seen this. Then you said you don't see it that often... So which is it?
What bullet are you using? With a 55gr bullet, that is a very light load. With a 107gr, you are a full grain over max; so that may answer it for you.
I think you should pull your bolt apart, if you have pierced them previously, you may have junk interfering with the firing pin protrusion.
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