I encounter a somewhat related problem after a brand new install today:
I played a bit around with these options, tabbed, vertical and horizontal.
By the time i had seen all 3 in action i switched back to the default vertical. Yet, the radio bottons are now in the middle of the width
and no matter what i mock around, including a CSS line “text aling left” in the style sheet of the template, no chance to get it back to align left!