RSU Cost Basis Quandary

In the past when I've had Turbotax upload my 1099-B it will input my RSUs as having a cost basis of zero which is expected.  However, this year after I've gone back and manually entered my cost basis in box 1e it doesn't change the taxes I owe.  Prior to making the change to box 1e Turbotax considers my all RSUs as taxable gains so when I enter the cost basis I'd expect my taxes owed to go down but it didn't at all this year.  I should also mention when my RSUs vest they withhold shares to cover taxes.  Any ideas why I'm not seeing my taxes owned go down?

 

Thanks in advance.

 

Dan