It looks like you are using Wisten version 1.0 but the current version is 1.2. See the changelog:
http://themeforest.net/item/wisten-one-page-parallax-theme/6534018
If updating, take a backup first.
I've not yet seen WooCommerce successfully deployed on a one page theme, and the theme's list of features does not include WooCommerce support.
As this is a commercial theme, you should ask the vendor for advice:
http://themeforest.net/item/wisten-one-page-parallax-theme/6534018/support
http://codex.wordpress.org/Forum_Welcome#Commercial_Products
Ultimately you may need to look for another theme that does feature WooCommerce compatibility.