Schedule 1 Line 1 Error in Turbotax

In calculating Schedule 1 Line 1 on form 1040, TurboTax is not calculating this correctly. If you go to page 86 of IRS 1040 instructions you will get a schedule 1 line 1 worksheet. The calculations from that worksheet do not match up with TurboTax Schedule 1 Line 1 worksheet.  How do we get help concerning this discrepancy? We have spent 2 1/2 hours on the phone so far with TurboTax and still haven't found a resolution to the error.