The way you're setting the default image is correct. However, the link you're using isn't working for me:
www.kapapusa/images/logo1.png
I get a 404 not found error when trying to load that.
Please make sure your link is correct to logo or other backup type image you want to set.
In your site is the following line:
<meta property="og:image" content="http://kapapusa.com/templates/rt_paradigm/images/logo/logo-og.png" />
That's not being set by JFBConnect and is likely being set by your template (but could be from another extension). That logo is what's being used.
To test different tags and see what's being set, we'd recommend using the
Social Meta Debugger
tool, which works for many social network, or Facebook's own
Debugger
.
I hope that helps explain and get you going a little more, but if not, just let us know.
Thanks,
Alex