WooCommerce: products showing out of stock until logged in

Hi,

All the products in my store are showing as “sold out” until the user logs into the site, and then the correct display is shown (only products that are actually out of stock show as out of stock, the rest are available). Before the user logs in all the products show as “sold out” even though they are not sold out, but if you click on a product and open it, you are able to add it to your cart as normal.

This may be a woocommerce issue, but I suspect it’s a compatibility issue with Highend as I’ve only had the problem since installing to Highend. I’m using WooCommerce 2.3.13 and Highend version 2.4.5