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The combination of Stacked Headers, Grouping and normal Filter seems to mess up the head column widths. Using 20.3.0.58.
In test case:
Stacked column headers (by itself) works OK,
Stacked column headers with Grouping works
Stacked column headers with filtering (but no grouping) works,
But if you have stacked columns, with filter bar, and grouping, then the grid loses all column header widths