I don't know why it happens, but it happened to me, too. The three radio
buttons of a radio button group were aligned with the same Y coordinate.
When I pressed tab to navigate to the radio button group, the middle
radio button was selected. After slightly raising the first radio button
and slightly lowering the third radio button, I pressed tab, and the
first radio button was selected. I also found that more significantly
raising the first radio button caused the first radio button to be
select...