[SQL] Duplicate Entry Key error when initial 6 characters match

I have a table BLE_PINS with columns TN, MAC, PIN, and Date. MAC is the primary key. When entering

INSERT INTO `BLE_PINS` (`MAC`, `PIN`) VALUES ('SEEP413E68','99933');


I get the error

#1062 - Duplicate entry 'SEEP41' for key 'PRIMARY'`.
​

It seems to be matching only the first 6 characters. Is there a way to change that?

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