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https://docs.oracle.com/javase/tutorial/uiswing/components/table.html
автор Sorting and Filtering

When a table uses a sorter, the data the users sees may be in a different order than that specified by the data model, and may not include all rows specified by the data model. The data the user actually sees is known as the view, and has its own set of coordinates. JTable provides methods that convert from model coordinates to view coordinates — convertColumnIndexToView and convertRowIndexToView — and that convert from view coordinates to model coordinates — convertColumnIndexToModel and convertRowIndexToModel.

NOTE : When using a sorter, always remember to translate cell coordinates.