Amended return - possible error in TurboTax

After filing my 2024 returns (both federal and state), and receiving my refunds, I received a 1099-R from a pension disbursement agent showing a taxable income of $657. However, on the 1040-X after adding the amount on the additional 1099-R, line 1B shows a net change in adjusted gross income of $1217. How can the AGI be almost double the amount on the new 1099-R?

Gary