Facebook Like button broken on homepage

Hello

At some point in the past 48 hours the Facebook Like button on my WordPress site’s homepage (http://www.sehkelly.com) has stopped working.

When clicked, rather than pull in homepage data, it pulls in data of the most recent post.

I have not changed any code, but the relevant meta tags in my site header are:

<meta property="og:url" content="<?php the_permalink(); ?>" />
<meta property="og:site_name" content="<?php bloginfo('name') ?>" />
<meta property="og:type" content="article" />
<meta property="fb:admins" content="1734267835" />

Any help would be very much appreciated.