If you use the popular WordPress template X-theme in combination with Gravity Forms, you may experience some problems with CSS Ready Classes. There is a simple solution for that.

X-theme & CSS ready classes Gravity Forms
How to solve the X-Theme and Gravity Forms CSS ready classes problem
Paste this CSS code in style.css in your WordPress theme folder and all problems will be solved.
.gform_wrapper ul.gform_fields li.gfield {
margin-right: 0 !important;
float: none !important;
}