The issue here is a credit for an Alternative Minimum Tax (AMT). If you have a year in which you pay an AMT due to timing differences, you can get a credit for it in a future year. Somehow such a credit was populated on your tax return and carried forward and used evidently over several years.
To remove it, you need to go to the Estimates and Other Taxes Paid section in TurboTax, under Deductions and Credits, and select Credit for AMT Paid in Prior Years. There, you will see a screen that says Tell us about your 2020 tax return, and you will see an option to change the carryover AMT credit as listed on your 2020 tax return form 8801.
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