Try deleting that 1099-R:
Click Federal Taxes (top menu)
Click Wages & Income (just below top menu)
Scroll down to Retirement Plans and Social Security and click Show More (if necessary)
Click Edit/Revisit next to IRA, 401(k), Pension Plan Withdrawals (1099-R)
Delete that 1099-R from the 1099-R summary screen, or if all else fails:
In the top menu, click My Account, then
Tools, then
Delete a Form (within Other Helpful Links)
Select Delete next to the relevant 1099-R
Then go back to the 1099-R section and enter manually.
