I have the same type of problem with my 2020 return. It placed my $300.00 Cash Charitable Contribution amount on line 6 of the TT Social Security Benefits Worksheet which reduced my taxable social security benefits.
When I go back and delete the $300.00 from "Deductions" section of where you input the figure, the amount then disappears from the SS Benefits Worksheet and the correct amount is displayed. Also, if I go and delete the $300.00 from the worksheet itself using the "Override" function then the correct taxable Social Security Benefit amount is displayed on the Worksheet. I verified the correct amount using the IRS Interactive Tax Assistant (ITA) program and both amounts were the same. TT has a problem and I have tried several times to explain the problem to TT to no avail.
