browser browsers cart clicking clicks code consistent ejunkie empty happens iframe impossible lightbox popups purchase puts refreshing reloads site system update user weird zip

I'm trying to get e-junkie to work with my lightbox (so the site's popups are consistent) however on some browsers, ejunkie reloads the lightbox iframe when clicking update, but instead of refreshing the cart in the iframe, it says the cart is empty.

this happens each time the user puts in their zip code and clicks update, making it impossible for them to purchase.

is there a work around for this?

It's weird, sometimes it happens sometimes it doesn't... same browser, same system.

Any thoughts on this?