In using Feedback 5.0.2 with DNN 5.5.1, the Message Body field exhibits strange behavior.  When first displayed, you see a scroll bar down the right side of the field, and the box is the same width as the other fields.  When you start typing in the field, the width pops out wider to the right about a half inch beyond the other fields and the scroll bar disappears.  The view of the text typed into the field is truncated on the right hand side (as if the view is cut off) even though the text itself is retained.

Changing the Form Width in the Form and Fields Settings works as expected, but seems to have no effect on the behavior described above.