In adding a 2017 $15 state tax refund to my IRS 2018 income, Turbotax indicates that I increase my 2018 IRS taxes by $11 (since in a 22% tax bracket I had expected only a $3 increase). When I pretend that the state refund to be added as income is $100 I increase my 2018 taxes by $22 (and for my 22% tax bracket 22% this is correct). Is something wrong with the Turbotax program?