Drop Down Menu

The CSS may be something as simple as:

#site-navigation ul ul {
 text-align: left;
}

Do you have a “Custom CSS” part of the dashboard or similar?

Install this “Custom CSS Manager” plugin: http://wordpress.org/plugins/custom-css-manager-plugin

Then look for the “Custom CSS Manager” part of the dashboard: http://wordpress.org/plugins/custom-css-manager-plugin/screenshot-1.jpg?r=704634

And enter this code into the “CSS code” bit:

#site-navigation ul ul {
 text-align: left;
}

Save changes.