It's difficult (if not impossible) to troubleshoot a situation when you can't view the program to see what's happening, or see the tax forms. You are correct, the exercise only of Incentive Stock Options is a non-taxable event for regular tax, but it is a preference item for calculating AMT. You may want to consider switching to TurboTax Desktop, which has a Forms mode that will let you view the forms and worksheets and see the flow of data. If you're interested in doing this, then go to How do I switch from TurboTax Online to the TurboTax software? You can transfer your Online data so you won't have to reenter anything.
Another option would be to utilized TurboTax Live, and go through your return line by line with a tax expert. For information, see What is TurboTax Live?
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