Thank you for the clarification.
As you mentioned Multi Column headers, I remembered that this functionality does not support re-ordering of columns. Here is the official documentation article: Limitations - Reordering.
"Column reordering is available at the same level of sinigle column headers. This means that multi-column headers cannot be reordered and columns can only be reordered within their own column group."
With that said, you could only re-order the columns within the same group, or, if reordering one column, you must move all the other columns in the same group with it.
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