Without seeing pics I'd guess your FP is adjusted to long causing the FP to push forward onto the primers anvil leaving an impression of the anvil at the bottom of the normal FP indent. Just a SWAG as I've never heard of such a problem ??? If the "nipple" you describe is at the bottom of the indent left by the FP & not protruding above the case head this would be my best guess. A pic would be a BIG help
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