Wrong linking in Facebook

Hi everybody,

I am a little desperate.
So, I changes my design to the ‘Jovan’, I customized it, got through the CSS, made it look nice, everything was fine – well … almost.
I wrote a new article and copied the URL, paste it to Facebook. The thumbnail under the post appeared, BUT the link at the thumbnails does not lead to the article, instead it leads to the mainpage of my wordpress.
I changed the design again and it worked, so it has to be a design problem. I tried to conatced the Jovan-maker, but I get no answer. I googled the problem, but coundn’t find anything about it. I’m sure there must be a way to change it in the templates, I just don’t know how 🙁
Could somebody help me, please.

Best wishes

Joyce