It didn't happen during the minting process. It's just damage and not an error. Study up on the minting process. It will take some time to learn, but once you know it, it will be easier to understand.
Actually there is no way for it to move during minting, the mintmark is on the die and when the coin is struck, none of the features on the die can move. A sharp hit at any time after the coin leaves the dies though can displace metal.
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