Deductions & credits

Not sure the reply solved this user's issue.  And we are having a similar issue.  Using TurboTax online, we are trying to add a Backdoor Roth Conversion of $7500 but it is calculating a Taxable Amount of $7453 and it should, of course, be $0.  Followed these instructions: backdoor-roth-ira-conversion  but to no avail.  Appreciate any help or guidance.  Thanks!