Pop Up Detection of Country Not Working

I'm trying to create a pop-up that only shows for non-US visitors, and have used the active condition "Not in a specific country" = "USA" and it is still showing up.

I have deactivated my caching plugin, so I don't know what else it could be.

The site in question can be seen here: http://dev.adonit.net

Any ideas?

Thanks,

Alex