Get your taxes done using TurboTax

Using TTAX premier 2019.  I did the return for my students and initially selected "pre-tcja."  Yesterday (3/19) ttax gave me a $3482 tax for one student.  Today, after the update, it jumped that tax to 6214 (still saying pre-tcja).  But then I tried using tcja and it says 3089, even better than before.  

Can anyone tell whether the 8615 calculation after the 3/20 update is correct?