Regardless of how the erroneous value got on the Carryover Worksheet line 6, 2020 column, you should change it to show 110% of last year's tax liability.
If the value on the Carryover Worksheet in forms mode mode is shown in blue, it's been manually entered. If it's the value carried over from your 2020 Carryover Worksheet, it will be shown in green.
