I agree with your analysis, but since we can't see your input it is hard to diagnose.
This also agrees with the following from TT:
https://turbotax.intuit.com/tax-tips/investments-and-taxes/incentive-stock-options/L4azWgfwy
You may have to call TT and have them determine if you missed some box to check, etc. While this is not a new adjustment, just make sure your TT software is up to date as that will most likely be the first thing the TT representative will ask.
Essentially the AMT adjustment is the bargain element in the year exercised.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
