facebook Likes on some of the articles have disapeared

You're using the ITP Share plugin, which is fine, but will need a slight change in configuration. Please open that up, and in the parameters, disable the "Include Facebook Javascript API" and "Include Facebook Root Tag", or something similar. They're re-including the Facebook Javascript library that we're already doing, which will cause conflicts with JFBConnect.

Hope that helps,
Alex

I'm honestly not sure of the cause of that, but since it's saying that you need an Open Graph image tag, I'd definitely recommend re-enabling the Open Graph integration within JFBConnect. Additionally, set a default image for your site to use so that if one isn't found in the article or specifically specified, that an image will be available to Facebook.

As for why this is requiring an image, looking at the linter tool on Facebook, it's seeing that in the title of your page is the word "Rights" and is therefore thinking the type of page is meant to describe "rights" (like a privacy policy, intellectual property, etc), and therefore requires an image when posting. In JFBConnect 3.4.1, we default the type property to website, which doesn't require an image. If you're using a version before that, you should also set a default type in the Open Graph box:
type=website

Once setup, re-lint your page (below) and hopefully, the Like button will start working. If not, let us know:
developers.facebook.com/tools/debug/og/o...%3D29%26Itemid%3D137

Good luck,
Alex