The issue:
at some values of hbar the left/right border of the table is visibly "narrowed" in the content region, as if it were partly hidden by first/last cell or row.

To reproduce:
 - run and make sure that the vbar is not visible, the hbar is visible
    and there are enough pixels for scrolling horizontally
 - move hbar slowly (best pixel-wise) and look closely at the right border of table
 - expected: right border visible at its full width at all times
 - actual: at some values, the right border is much thinner than most of the time
 
 actually similar at left border, but harder to detect: at both sides, there's
 a detectable jitter of the border when scrolling quickly (look at the empty rows)

The example:

public class PlainTableViewSample extends Application {

    private Parent createContent() {
        TableView<Person> table = createPlainTable();
        BorderPane content = new BorderPane(table);
        return content;
    }

    private TableView<Person> createPlainTable() {
        TableView<Person> table = new TableView<>(Person.persons());
        table.getColumns().addAll(createColumn("firstName"),
                createColumn("lastName"), createColumn("email"), createColumn("secondaryMail"));
        return table;
    }
    
    private TableColumn<Person, String> createColumn(String property) {
        TableColumn<Person, String> column = new TableColumn<>(property);
        column.setCellValueFactory(new PropertyValueFactory<>(property));
        return column;
    }
    @Override
    public void start(Stage stage) throws Exception {
        stage.setScene(new Scene(createContent()));
        //stage.setTitle(FXUtils.version());
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }

    @SuppressWarnings("unused")
    private static final Logger LOG = Logger
            .getLogger(PlainTableViewSample.class.getName());

}


for convenience, the data class

/**
 * Example fx bean. Copied from tutorial with added
 * property accessors.
 */
public class Person {
    private final SimpleStringProperty firstName;
    private final SimpleStringProperty lastName;
    private final SimpleStringProperty email;
    private final SimpleStringProperty secondaryMail;
    
    public Person(String fName, String lName) {
        this(fName, lName, "");
    }
    public Person(String fName, String lName, String email) {
        this.firstName = new SimpleStringProperty(fName);
        this.lastName = new SimpleStringProperty(lName);
        this.email = new SimpleStringProperty(email);
        this.secondaryMail = new SimpleStringProperty("xx" + email);
    }
    
    public String getFirstName() {
        return firstName.get();
    }
    public void setFirstName(String fName) {
        firstName.set(fName);
    }
    
    public StringProperty firstNameProperty() {
        return firstName;
    }
    public String getLastName() {
        return lastName.get();
    }
    public void setLastName(String fName) {
        lastName.set(fName);
    }
    
    public StringProperty lastNameProperty() {
        return lastName;
    }
    public String getEmail() {
        return email.get();
    }
    public void setEmail(String fName) {
        email.set(fName);
    }
    
    public StringProperty emailProperty() {
        return email;
    }
    
    public String getSecondaryMail() {
        return secondaryMailProperty().get();
    }
    
    public void setSecondaryMail(String mail) {
        secondaryMailProperty().set(mail);
    }
    public StringProperty secondaryMailProperty() {
        return secondaryMail;
    }
    
    @Override
    public String toString() {
        return getLastName() + ", " + getFirstName();
    }
    public static ObservableList<Person> persons() {
        return FXCollections.observableArrayList(
                new Person("Jacob", "Smith", "jacob.smith@example.com"),
                new Person("Isabella", "Johnson", "isabella.johnson@example.com"),
                new Person("Ethan", "Williams", "ethan.williams@example.com"),
                new Person("Emma", "Jones", "emma.jones@example.com"),
                new Person("Lucinda", "Micheals", "lucinda.micheals@example.com"),
                new Person("Michael", "Brown", "michael.brown@example.com"),
                new Person("Barbara", "Pope", "barbara.pope@example.com"),
                new Person("Penelope", "Rooster", "penelope.rooster@example.com"),
                new Person("Raphael", "Adamson", "raphael.adamson@example.com"));
        
    }
}