Double add to cart problems

The plugin make an empty href attribute on home page, cart page,…

<link rel="image_src" href="" />

This causes a double cart issue.

Known conflicts from WCdocs:

Double add to cart issues
Check your page source for any empty background-image (css) properties, or img and link tags with empty src/href attributes. These can cause pages to load multiple times.

https://wcdocs.woothemes.com/codex/integration/known-conflicts/

https://www.ads-software.com/extend/plugins/woocommerce-facebook-share-like-button/