Comment Plus post appear on different post

I am running Comment Plus on a multisite network. The plugin is working fine with some blogs, but for others when a comment is created for a particular post, the comment appears on a post that was previously created. This is happens for FB and Twitter. And the comments also leave links (on Twitter and FB) pointing the the the wrong post. Alternative Facebook Initialization has been activated.

Any idea what this could be and how it can be fixed?