[Plugin: WP e-Commerce] Additional description dropped down automatically

I use Wp-Ecommerce version 3.8.8.3 with WP 3.3.2 and Wp-Creativix theme. On the products page, all the products that have additional descriptions are dropped down automatically. This made the product page so long with all information in the Additional descriptions showed instead of hiding.

Please take a look at: http://phuongnamstar.net/?wpsc_product_category=tour-campuchia (looking for the + symbol button please)

Please help me to fix this. Thanks

http://wordpress.org/extend/plugins/wp-e-commerce/