I just noticed today that the data-width attribute for the Facebook Like Box widget does not appear to be working. It looks like it is reverting to the default width. An example
After the fb:like-box
add this script
change the 244px to your width
FB.Event.subscribe('xfbml.render', function(response) {
var el = document.querySelector(".fb_iframe_widget span");
el.style.width='244px';
el = document.querySelector(".fb_iframe_widget iframe");
el.style.width='244px';
});