Thanks for the access. Unfortunately, it seems like that's just how Facebook shows the Like Box when configured to *not* show Faces. You can fully test using their configuration tool and test the different outputs with all the settings:
developers.facebook.com/docs/plugins/like-box-for-pages
One other option that may work for you is simply using the "Like Button" instead of the "Like Box". That can be used to Like a Facebook Page, but it won't show the image from the Facebook Page like you're currently showing.
I hope that helps you find a solution that works for you, but if you have any more questions, just let me know.
Thanks,
Alex