Additional info..... I figured out the source of the problem. It appear TurboTax was very confused with the excess advance premium tax credit I reported on form 8962 and that amount was correctly reflected on 1040 Schedule 2 and then added in to my tax on 1040. However, for some strange reason that number was left out of the tax info on the 1040-X showing original amounts, so it thought there was a big increase in my tax because of that adjustment. So, when I opened forms to edit the 1040-X, I corrected the original amount of tax liability on the 1040-X and made sure all the before and after compares were correct.
