Your $35,000 distribution in 2017 reduced your Roth IRA contribution basis to $0. With everything entered properly into 2017 TurboTax, TurboTax would have carried forward $0 of contribution basis to 2018 and from there to 2019 to appear as $0 Roth IRA contribution basis in 2019 TurboTax, not the $18,500 that presently appears in 2019 TurboTax.
Your $35,000 distribution in 2017 also reduced your Roth conversion basis by $16,500 (assuming that you had that much conversion basis in 2017), reducing the oldest contribution basis first. If you were under age 59½ at the time of the distribution in 2017 and your Roth conversions in 2012 were less than $16,500, some portion of that $35,000 distribution would also have been subject to a recapture of the 10% early-distribution penalty. As of 2019, though, all of your conversions had met the 5-year conversion holding period, so any of the $30,000 distribution in 2019 that was from your conversion basis, perhaps all of it, is tax- and penalty-free (or all tax- and penalty-free if you were over age 59½ at the time of the distribution).
