I know this is an old post but it's still happening.
Add this inline to the code facebook gives you:
data-height="30px" data-width="130px"
And this to the CSS
.fb-like {
width: 130px !important;
}
Of course, you can change the width to whatever you want.
So your code should look like this (where XX is replaced with your parameters):
<div class="fb-like" data-href="XX" data-send="XX" data-layout="XX" data-show-faces="XX" data-height="30px" data-width="130px">
This is only a temporary solution until it is fixed as the facebook button disappears after a minute or so.