If Turbotax is giving you the exact same sub-totals on Schedule D 1a and 1b, something is going very wrong with your import.
OP said: "You are only supposed to use just line 1a or 1b on Schedule D, and the same goes for line 8a or 8b for long term gains/losses."
That's not correct at all. But the chances of the exact same amounts on both lines is vanishingly small, IMO.
