Weird message on front page

Hi, I installed a plugin called ''Content - Perfect Link with Article Images on Facebook PRO'' to choose front page image when sharing on facebook. Now I am getting a weird message on the front page (but not all the time). Can you please help me fix it?

My site: http://www.almadinah.no

The message is:

Debug output of Perfect Link with Article Images on Facebook PRO

og:description - AlMadinah Institute: «Fordi alle ikke kan reise i søken etter kunnskap, bringer vi kunnskapen til deg.» AlMadinah Institute er et institutt som tar sikte på organisert undervisning i islam gjennom todagers seminarer annenhver måned. Ved å fast delta på disse seminarene vil man in sha Allah bygge et sterkt fundament i ens kunnskap om islam.
og:image -

Please contact the plugin support as it looks like something that this plugin causes.

Hmm, I think the problem is in the template because I am using the plugin on six other websites without having this problem.

Sorry but we doesn't support 3rd party solutions .
There are thousands of plugins. Some of them are good, some are bad and we can't test all them out. Also if they are written purely, this kind of problems might occur.