Default behavior of -fx-border-image-repeat seems to be wrong (looks like it doesn't match http://www.w3.org/TR/css3-background/#border-image-process).
Check attached images for details ("round" and "space" behave the same way as "repeat").
To reproduce, use the following code:


import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;

public class Main extends Application {

    public static final String style = "-fx-border-image-source: url(\"/border.png\");"
            + "-fx-border-image-width: 30px;"
            + "-fx-border-image-repeat: round;"
            ;
    @Override
    public void start(Stage stage) throws Exception {
        Button b = new Button("Test me");
        b.setStyle(style);
        stage.setScene(new Scene(new Group(b)));
        stage.setTitle(com.sun.javafx.runtime.VersionInfo.getRuntimeVersion());
        stage.show();
    }
}