BD,
A few suggestions to investigate:
* Make sure you have the Open Graph - K2 plugin enabled. That will automatically try to set the best image we can to use for the Open Graph image on the page. Open Graph tags are what Facebook uses to understand and describe your page.
* If enabled, run your page through the
Facebook URL Debug Tool
. That will scan the page for Open Graph tags and notify you of any issues. Let us know of any problems. It will also update Facebook's cached data for your page, so, if the tags weren't right before, but are now, they should start working. Otherwise, when you make Open Graph tag changes, it can take a few days for Facebook to 'see' the updates.
If none of that helps, let us know a URL where we can test with and we'll gladly investigate further.
Thanks,
Alex