As soon as I entered the 8606 line 6 values the correct computations were made. I presume I had to do this in prior years too, but I feel pretty certain that in those years the 8606's in the forms view would have had a red exclamation point alerting me to a need to do something with them.
Lastly, to reiterate what another poster said, you need to double click the 8606 field which opens a worksheet where the data is actually entered.
