State tax filing

I re-entered the state returns and did the Alabama non-resident return first.  Then did the GA resident return and there was a negligible change.   He still owes a lot to the State of Georgia and is assessed with a penalty for underpayment.    In both scenarios, GA recognized a credit for the taxes paid in Alabama, but Georgia also reduced the federal itemized deduction by almost $4300 apparently based on taxes paid in AL???