The STMT notation implies that there are multiple notations (perhaps ROLLOVER and QCD) and because they will not all fit in the available space they are included on a separate statement that TurboTax will include with your filing.
The gross amounts from Forms 1099-R reporting distributions from IRAs are summed on line 4a, not line 4b. Only the taxable amounts of the IRA distributions are summed on line 4b. Forms 1099-R reporting distributions from other types of retirement accounts are reported on lines 5a and 5b.
