I've had my own nodes downvoted for no reason I could figure out ...

I've caught myself at least three times doing this in IE: click on '++', use down arrow, wonder why screen isn't moving, notice that '--' is now chosen because the radio group was last selected and down arrow moved the check to the 'next' in the group.   I wonder how many times I've _not_ caught myself?   If people don't know they're doing it, don't wait for any explanations...