I've had the same thing happen...I received a letter today stating that we owe $1560.24. In looking at the tax docs from 2017, it appears that items from line DD were carried over to the state form (Step 6 - Adjustments to Income - Line 18). I did not enter values in for my state tax return...I just allowed TT to populate the information and assumed that everything was applied correctly.
In cross checking this with the 2016 and 2018 forms, this didn't happen and I took the same steps to input and process my tax information as I always do.
I'd like to be contacted about how Intuit plans to resolve this.
