Please go back to the beginning of the 1099-R section and verify that you selected "Office of Personnel Management (CSA 1099-R) For U.S. Government Civil Service retiree annuity" and not 1099-R.
When I get to the 1099-R section, I have 2 accounts displaying "Edit" and a 3d account (Off. of Pers. Mgt.) repeatedly displays "Needs Review" and offers only "Review", not Edit. When I do a federal review I get the "Where is your distribution from?" question and "needs info." in red. I select "none of the above" and continue. the end results is it is a loop! with the same result each time I go through it.
If you cannot edit the CSA 1099-R entry then please try to delete and renter the information to see if that will resolve your issue.
We cannot see the details of your return, therefore I suggest contacting TurboTax for more detailed help. Please see What is the TurboTax phone number?