Seems you have the z-index issue in the drop-down. As I don't have access to your website and can't figure out on which website you have the issue from your license page.
Please try adding this CSS to your theme option -> CSS. remember you have to assign a class name to the drop-down menu.
z-index: 99999 !important;
You can replace the class name.
If that doesn't help please send us your URL so that we can have a look.