You should make just one W-2 entry. The box 12 AA entry is for your ROTH IRA contributions. They are not deductible, so it shouldn't affect your tax return if you enter the wrong amount, so you should enter the amount you think is correct.
Put MD in box 15 if you earned your wages in Maryland. Box 16 would be your state wages and box 17 would be your state tax withheld. You should look on your last pay stub to see what are the correct amounts to enter there. The state wages would likely be the same amount as entered in box 1 on your W-2 form for the federal wages.
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