Currency keeps converting back to default

When I changed my currency, it will be converted back to the default currency as soon as move to other pages or refresh the page.

Also, the shortcode [woo_multi_currency_exchange price=”100″ currency=”EUR”] isn’t working, the currency will change but the price is always 0.00 no matter what. I’ve created a sample page that has this shortcode, I’ve put the link along with my site’s access information.

Thanks!