The method, paintFocus() of MotifRadioButtonUI.java is called whenver isFocusPainted is true and hasFocus is true. Sounds good but painting focus is also handled by its border when isBorderPainted is true. As a result of that painting focus is done twice when isBorderPainted is true;

by paintFocus of MotifRadioButtonUI and
by its ToggleButtonBorder defined in MotifBorderFactory.java

Please see 'Suggested Fix' tab.
bae-chul.kim@eng 1998-04-20