Why does Turbotax list my pension income under "Traditional and Roth IRA distributions?" How can I change the designation to "Pension and annuity distributions?"

You must have put a checkmark in the little IRA box between boxes 7&8 on the 1099R  go back and edit the 1099R.  Or delete the 1099R and re enter it.

FYI - If you edit or review a 1099R it does not keep your answers from before but resets them to the defaults. Then you have to go through and answer them all again.   So be sure to go all the way to the end of the 1099R section.  They are right unless you go back.  So you probably should go back and double check all of them.

Watch for this box.