Two Jump Menus = Illegal Choice Detected.

I'm creating a custom page that uses two separate Views as jump menus to navigate deeper into the site. I'm running into a problem that would probably be easier to show by viewing this page: http://www.gooverseas.com/study-abroad-test

The first jump menu (Country) works fine, but when I try use the city menu I get a "An illegal choice has been detected.." error. If I switch the menus, or take one out, each works fine, so clearly they are not interacting well together.

This is the code I used to inject them onto the page:

<?php print views_embed_view('jump_menu', 'block_3'); ?>
<?php print views_embed_view('jump_menu_city', 'default'); ?>

The views themselves are rather basic. I'm using the Node Path field to grab the URL.

I'm guessing there is some sort of shared parameter that's causing the conflict, but I haven't been able to identify it yet. Has anyone else come across this problem?

Cheers,
Andrew