It could be an inadequate upset on the planchet used to strike the coin. This was a common problem on the 1985 Roosevelt dime. The upset mill didn't raise the correct proto-rim for proper striking. The resulting coins have a soft, mushy look to the design.
Here's an image of the example I have in my collection.
ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!
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