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What you have may be a normal situation with loads having pressure too far below minimum.
When the firing pin strikes the primer with a normal max load, it drives the case hard into the shoulder setting it back a few thousandths. When the primer fires, the powder burns and expands the case starting at the shoulder then working back. This pushes out the primer so it stops against the bolt face then stretches the case back until the case head stops against the bolt face pushing the primer back into the case flush with its head.
I don't think the load used has enough pressure to do this. That's why the primers are sticking out of the case a few thousandths. Your barrel's bore and groove diameters may be way too big.
One exception to the above. . .the primer cup is extruding into the firing pin hole in the bolt face and a crater is formed with its outside edges above the rest of the fired primer's flat surface. This happens when the hole in the bolt face is is too big for the firing pin's tip diameter. Use a magnifying glass to check this.
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