[Plugin: WooCommerce Facebook Like Share Button] Fail with "Twenty Eleven" theme

When I have default “Twenty Eleven” theme enabled, and click Like button the box to post appears quickly and then disappears, and the like button is changed to “Confirm” text. What’s wrong here? This doesn’t happen with “Twenty Ten” theme. Also in Twenty Eleven theme the share box is clipped and you can only see some part of it.

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