1) I can't explain what Turbotax is doing internally to compute your total, although I suspect it is ether a data entry error, or another small gain.
2) I doubt that if you have an income discrepancy of $3 or so will affect your total tax bill.
15% capital gain tax rate on $3 = $0.45, which rounds down to $0.00.
3) If you think it is worth the effort, you can
a) recheck your data entry for each of your relevant 1099's
b) review your schedule D to see what the entries actually show and what total shows on that form
c) review your worksheet entries for your capital gains. (Check Print Center > Tax return and all calculation worksheets.
Good luck.
