State tax filing

Ok, I made the change, but now I'm even more confused.  In going through the step by step instructions, the screenshot below has my information correct.  (The double taxed amount is the 77% of my W2 taxable wages.)

When I accept that information and go on, the total income from MO shows as my W2 taxable wages.

However, the credit matches what is shown on the MO return as my tax liability.

If I change the 2nd screenshot so the "total income from MO" matches what the 1st screenshot shows (which is the 77% of my W2 wages), then the state tax credit is roughly $200 less.  Why wouldn't I get the full credit for my MO tax liability?