I posted this question and then figured out the problem. When you amend the return, you can save it and it will be have all the correct amounts on the 1040X. The problem of incorrect amounts I posted above seems to have resulted from my saving the amended file a second time, changing the name while saving. TurboTax somehow interpreted this as my filing an amendment to the amendment.
To correct the problem, I left the incorrect file, opened the original 2017 return and began the amendment process again. I was careful to save it only once under the name of my choosing. I can now save it and open it again and resave it, as long as the name is not changed a second time.
I think this is what solved the problem, regardless, I now have a correct 1040X and other tax forms to file for an amended return.
