If you have added a new drop-down menu option to your site and it doesn't look like the other drop-down menus there might be a simple reason why it doesn't and that is a missing style that needs to be applied.  

To check, edit the widget that is in the drop-down menu, click on Container located at the top of the widget and locate the Custom Class Name field. All drop-down menus should have DD-Menu entered into that field so that they are styled correctly. 

Please note that If there is a DD-Menu entered into the Custom Class Name field and the drop-down menu does not look correct please contact CampusSuite support.