Hello,
1. Try updating WooCommerce:
WooCommerce: par WooThemes – 2.6.13
2. Make sure the templates of ours that you are overriding in your theme are up-to-date (looks like they are, but we did update the product-edit.php template for v1.4.0, so it would not hurt to double-check).
3. If updating WooCommerce does not fix this issue, then switch to the Storefront theme and test to see if the fields are working properly.