2024 1040X Incorrect Values Line 6

I received a K-1 after filing my taxes (and after the 3/15 date that it should have been received) so I need to amend my return. I also found that one of my imports skipped an account so there were modifications to a 1099. I finally got through amending, so I have my new 1040, my filed 1040, and my 1040X (in the file with the new 1040).

Line 6 on 1040X contains the tax value on line 16 of the filed 1040 in column A. Column C contains the value on line 18 of the new 1040, so the 1040X is having me pay AGAIN the value on line 17.

The IRS instructions at https://www.irs.gov/instructions/i1040x say to use the value from Schedule 2 line 3, and that is NOT the value given.

Interestingly, it also has QDCGTW as the method used to calculate the tax. That value is line 17 of the new 1040.

Why is column A using line 16 while column C uses line 18?

Thanks for your assistance.

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