I recommend you delete your entry for the exercise and sale of your Incentive Stock Options. When you re-enter answer NO to the question "Do these sales include any employee stock?" Answering yes is only helpful with ISOs if you exercise and hold. When you enter your transaction enter the Cost Basis on your Form 1099-B and check the box below that for "The cost basis is incorrect or missing on my 1099-B. Continue to the screen with "Let us know if any of these situations apply to this sale" - check the box for "None of these apply. Continue and indicate that you know your cost basis and then enter your "Actual cost basis" - not an adjustment. As I believe you already know, that would be the exercise price plus the amount of the Bargain Element of the option that was included in your income and reported on W-2.
If you are using TurboTax Online, don't rely on the amounts that show in the interview sections of the program. They sometimes don't reflect adjustments. I recommend you go ahead and pay for TurboTax so you can print (or create a PDF) of your return or individual forms and schedules.
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