Reading primers, concave after firing

Another Casual

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With wildfires killing my hunting season I decided to get around to bedding my rifle. Afterwards I took it to sight in again. I fired 14 rounds of 6.5 PRC loaded with 140 Nosler accubond over 58.7 grains of H1000 and a CCI 250 primer. Velocity is around 3065. While shooting I had one flier and the primer looked different than anything I have seen before. Primer was concaved in the middle where the pin had struck while the others all looked uniform.

Does anyone have any advice on what may have caused this or what it is trying to tell me? I read around a few sites and did not find much. POI was not too far off, maybe an inch or so to the right of an otherwise tight cloverleaf group.
 

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I think you're right. I dry fired on a fired casing and it looks the same. I must have dry fried with that casing still in the rifle.
 
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