Facebook Likebox is not responsive and makes js to work not properly if it takes long to load.
Here is the solution to make the block responsive and to force it load after the rest content of the page.
You need to change iframe code to this:
Please check if jQuery js library is enabled for the pages where this block is displayed. Without this library the fix would not work.
Also do not forget to change a link to facebook page to your own.
In order to change a link you can use this tool: URL Decoder/Encoder
would be changed to this: