How much more is line 5a? It's common for 5a to be less than 5b but not more. I would check your entries, you may have typed box 1 wrong. I would delete that 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.
