On 2019 form 1040 line 12a, Turbo Tax is calculating tax different than what I get when I go to the tables using the taxable income from line 11b.

The taxable income is $26,135 (Line 11b) and TurboTax calculates tax (Line 12a) as $2,347.  If I go to the tax tables with taxable income of $26,135,  I get $2,941.  Any idea what I am doing wrong?