Non Resident PA return PA Schedule NRK-1

When I post the income for the estate/trust amount, Turbo Tax calculates an amount of tax due.  When I post the amount of PA tax withheld no adjustments are made to the amount due or refund.

 

However, if I change the amount of income, the amount due or refund is recalculated.  It appears as though the amount of PA tax withheld in not being considered.  Please help.