This is a bug in TurboTax. See workaround here: https://ttlc.intuit.com/community/retirement/discussion/re-inherited-ira-gross-amount-flows-to-my-fo...
The workaround goes away though after you save/close/re-open the file though, so I'm not sure what actually gets sent to the IRS when you eFile. Hopefully, TT will fix soon.
