Facebook sharing of an announcement of a page

Hi,

I currently have the issue that it is not possible to share this announcement on Facebook. If the pop up with all the social platforms is visible and I close Facebook the popup of Facebook closes immediately....all the plattforms seem to work...

here is the link of the announcement:

http://oggersheim-online.de/seiten/2-spielraum-froschlache/apps/48-announcements/Eintrag/2

Another "issue" I realized using the Facebook debugger is that the open graph met data is then used from the website and not from the page description where the announcement is placed. Is there any "workaround"?

Thanks for your support.