Metas not saved on EasyDiscuss page

Hi

I'm again having some trouble saving metas on my page. This time on a page from EasyDiscuss: http://www.issdichfit.ch/index.php/fragen/kokosfett-erhitzen-ja-oder-nein

I tried to alter the FB OpenGraph metas. The image was stored correctly but any changes to the description aren't going to be saved.

On other sites like Joomla! articles metaman works as expected.

I don't see any exceptions in the WAF Log from AdminTools nor any errors in the java script console.

Best regards and thank you very much

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