I run into exactly the same issue, here is how I fixed it:
- From the Income & Expense page, scroll down to Capital Loss Carryover
- Click Edit, and the next page will display the following, Here's what we have for you.
- Click Edit again and the next page will display: Great, we'll guide you, starting with some info from your 2020 tax return
- Click Continue you arrives at the page displaying: You probably don't, but we have to ask—do you have different carryover amounts for AMT?
- Chose Yes, I did (This is uncommon.) and then click on Continue
- Now you can edit/correct your AMT capital loss carryover on the page displaying: In that case, let's get some info about your AMT
