Since PA does not have a deduction for the 401K, seems your employer may need to issue corrected W-2 to show the PA income including any of those type contributions that may have reduced the PA income.
Pennsylvania is one of the few states that does not follow the federal rules on 401(k) contributions. PA does NOT exclude 401(k) contributions from a taxpayers income - thus, making contributions taxable.
PA Rules Regarding Retirement Accounts
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