Pension reported on 1040 4b added to income. Line 11 indicates tax owed on AGI including pension income. Line 14 other taxes, which is tax on pension = double tax. Why?

Turbo Tax Deluxe Online: I received a pension, it was added to 1040 Line 4b which was added to my other income to equal AGI. My standard deduction was deducted = taxable income. Tax on income was indicated under Line 11.  Line 14 added in the tax on the pension - which was already included in AGI and thus included in the Tax (Line 11). To add this tax in again is a double tax. Is Turbo Tax Deluxe not functioning properly or am I thinking this through improperly?