Using Contact Form 7 problem aligning checkbox

There seems to be a problem whith using check boxes when using Contact Form 7.
By default a checkbox should align left followed by the label.
Now the checkbox seems to be aligned at the center followed by the label on a new line.
Using “Label first” option shows a left aligned label and on a new line a center aligned checkbox.
it seems that the Nalleto theme causes the problem. Even on a empty page.