I think you meant "already taxed NJ IRA contributions."
perhaps there was a bug in 2017 that was corrected in 2018 Turbotax.
The other answer i removed shows a different bug in a related area.
to get the proper tax exclusion amount, work it up as a regular distribution, not a conversion
Turbp tax will; handle that.
PS if you amend, your 2018 recovered calculation will also have to be recalculated
