Your W-2 shows state income taxes withheld in box 17 and your employer is in Washington state?
That is not possible since Washington does not have a personal income tax.
If there is an amount in box 17 then you need to get a corrected W-2 from the employer and find out why there is an amount entered.
If there is no amount entered in box 17 the leave boxes 15, 16 and 17 blank
