My 1040 form line 15b is pulling gross distribution amount, not taxable amount from my 1099-R. The gross distribution is blank in box 15a. How can I fix this?

In other words:
1040 form box 15a:  no distribution shown (blank)
1040 form box 15b: gross distribution from my 1099-R shows rather than the taxable amount from my 1099-R.

Our IRA does have a basis that is different than 0.  

In the past, we completed Form 8606 to be submitted manually with the return because it didn't come up within Turbo Tax.  Perhaps I need to find out how to add this form in TurboTax or keep doing it manually.