There's an ordering bug with JFBConnect right now when using default tags, Open Graph plugins and {SCOpenGraph ...} tags. The meta data should be set in the following order: {SCOpenGraph ..}, Open Graph plugin, and then default, so that if one doesn't exist, the next is used.
I haven't heard of the default tags being used instead of the Open Graph tags. However, looking at the EasyBlog Open Graph plugin code, I believe I see what's happening. Since EasyBlog sets it's own title tags, we don't try to overwrite them in the plugin.. but then, later in JFBConnect code, we set the default tag if no plugin or {SCOpenGraph title=xyz} tag is found. So, the plugin is trusting EasyBlog to set the tag, and JFBConnect isn't trusting something else to do it.
We're looking into a solution for the ordering issue mentioned first, and will look into the EasyBlog issue you found as well. Would you want the standard meta title to be used? If so, that'd be pretty easy to implement with a line or 2 of code. Otherwise, I'd recommend removing the default title tag for now.
Thanks,
Alex