1. Can you tell me which element that you mean on above (the poster) ? Just want to make sure on this thing.
2. Please try to install JNews – Meta Header plugin. You can install and activate this plugin on the JNews > Install Plugin then search Meta Header (Share) tab.
3. About the description issue, we already notice this issue. We will release a new update (hotfix) for this issue as soon. Thanks for your report.