drfortini, not sure if you are still dealing with this issue, but if you are here is a potential fix.
In the new form set up the multiple choice fields extend out to reach where the next horizontal element on the form would be. How far this reaches is dependent on the overall horizontal area for the columns set up vertically within the section this box is in. One work around is to insert a text form element, not field, into the form on the same line as the choice field and place a " " in it (without the quotes). This will limit the length of the multiple choice field to where the next column would align with no visual impact with the new field as it is only holding a space in it. The text element must have the space in it for this to work as it will ignore the format fix on a blank text element.
