Check the actual 1040. Line 4b is larger than 1099R box 2a. Is 4b larger than box 1? What code is in box 7? And you only have 1 1099R ? Did you try deleting all 1099R forms? And you still have an amount on 4b? Try deleting all 1099R then enter it again MANUALLY. That usually fixes it especially if you imported it.
