Turbotax requests information from 2015 tax returns as identity verification for 2016. One such request is "Tell us what's on line 21 of your form 1040A" followed by a box to input the information.

The next page is to double check that number, and requires users to verify the number is:
On my 2015 return.
Line 37 of my 1040A
The exact number.

All boxes must be checked in order to proceed with filing.

Is this a technical problem?
If not, which number is actually supposed to be submitted?