I figured out how to move where the Model number gets placed in the stack. That also led me to find that the Duplicates Sort Headings were somehow resulting from a lack of pictures on the test site.

Not sure why the problem appeared to be with "Weight" only there, but when I tested locally, the duplicate heading was changing depending on how I stacked the information. That stopped when I turned off the non-existent images. Then when I loaded images, and turned them back on in the list, there was no problem.