Error showing og:image

Question

I have problem with og:image in my website. og:image is displayed correctly only if I'm logged into their website sharethis.com with my facebook account. If I'm not logged in og:image picke some random image from my website.

I'm using DataLife Engine 10.1 and applied this script:

<script type="text/javascript">
$(document).ready(function(){
$("head").append('<meta property="og:image" content="[xfvalue_slika]" />');
});
</script>

Only when I'm logged into their website, image in tag [xfvalute_slika] is displayed when I share news on facebook. When I logout and try to share again, og:image choose some random image from website and display.

Even if I look at source code, the image path is taken correctly but not displayed on facebook. As previous said random image is shared on facebook wall.