It looks like there's 2 styles affecting that button. Both are in the /components/com_easyblog/themes/wireframe/styles/style.min.css file:
div#fd.eb .sourcecoast.login .social-login.facebook {
float: none !important;
}
That's what's making the button shift to the left. Without that style, it's right after the Amazon button.
div#fd.eb .sourcecoast.login .social-login.facebook>a {
display: inline-block;
margin-top: 15px;
}
The margin-top is what's pushing the button down by 15px.
Those files are compressed, and I'm not sure what those styles are supposed to be affecting, but they are definitely targeting the JFBConnect Facebook login button.. for better or worse.
I hope that helps,
Alex