This happens when I tried to change the CSS of my Geodirectory plugin.
Below is the steps I have done in order to center my GD search bar :
1)Geodirectory > Design > Scripts > Custom Style CSS > paste
.geodir-search {
border: none;
float: none;
margin: 0 auto;
width: 400px;
}
Even after I deleted the script and saved it the problem still remained the same.