Code to reproduce:
package javafxtable;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.stage.Stage;

public class JavaFXTable extends Application {

    public static void main(String[] args) {
        Application.launch(JavaFXTable.class, args);
    }

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Table issues");
        ObservableList<Record> records = FXCollections.observableArrayList();
        for (int i = 1; i <= 100; i++) {
            Record r = new Record((long)i, "Name "+i);
            records.add(r);
        }
        Collections.shuffle(records);
        TableView<Record> root = new TableView<Record>();
        TableColumn<Long> columnId = new TableColumn<Long>("ID");
        columnId.setProperty("id");
        TableColumn<String> columnName = new TableColumn<String>("Name");
        columnName.setProperty("name");
        root.getColumns().addAll(columnId, columnName);
        root.setItems(records);
        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.setVisible(true);
    }

    public static class Record {
        private final Long id;
        private final String name;
        public Record(Long id, String name) {
            this.id = id;
            this.name = name;
        }
        public Long getId() {
            return id;
        }
        public String getName() {
            return name;
        }
    }
}


Steps:
1. initial state - see picture1
2. click on first column - ascendant sorting by first column see picture2
3. click on first column - descendant sorting by first column see picture3
4. click on first column - unsorted (initial state) see picture4
Expected: initial state (unsorted)
Actual: last sort order - bug.