Run the following sample code:

public class TableSelectionBug extends Application {
   public static void main(String[] args) {
       launch(args);
   }
    
   public void start(Stage primaryStage) {
       primaryStage.setTitle("Table Selection Bug Demo");
       TableView<String> table = new TableView<>();
       TableColumn<String, String> column1 = new TableColumn<>("Column 1");
       column1.setCellValueFactory( null );
       column1.setPrefWidth( 100 );
       TableColumn<String, String> column2 = new TableColumn<>("Column 2");
       column2.setPrefWidth( 100 );
       
       table.getColumns().setAll( column1, column2 );
       table.getItems().addAll( "1", "2", "3", "4", "5", "6", "7" );
       table.getSelectionModel().setSelectionMode( SelectionMode.MULTIPLE );

       StackPane root = new StackPane();
       root.getChildren().add(table);
       primaryStage.setScene(new Scene(root, 600, 250));
       primaryStage.show();
   }
}

This creates a TableView with 7 rows and 2 columns, plus a few "empty" rows and columns. You'll have to use your imagination a bit here, since for brevity my sample doesn't have cell value factories, so you can't actually see any values in the 7 populated rows and 2 columns.

The bug here involves selecting multiple rows. First, click on (row 1, col 1), then hold down shift and click on (row 5, col 1). 5 rows become selected, no problem. Now, continue to hold down shift and click on (row 1, col 1) again. What?! Only rows 2 and 4 become deselected.

A second problem here is also related to selecting multiple rows. First click on (row 1, col 3) -- that's an empty "filler" cell, since there is no column 3 in this table. The first row is selected, as you'd expect. Now hold down shift and click on (row 5, col 3). Strangely, only row 5 is now selected--it behaves like you weren't holding shift down when you clicked!

In other words, shift-selecting doesn't work if you click on cells in that third "filler" column, even though regular selection and control-selecting works fine for those cells.