issue on Form 1040-X

I amended my return by adding a loss from stock account. On TurboTax's 1040-X form, 1C is correct, 1A+1B=1C is also correct, but neither 1A nor 1B is correct. 1A supposed to be original amount reported, 1B should be the loss amount I amended. The other forms are normal, only this 1040-X is having issue. I have no clue where those numbers come from on the form.