That's odd. I'm not seeing the { JFBCLike } text or the Like box. So, it's either not on that page correctly, or we're stripping the tag but then not replacing it correctly.
In your article, can you try adding something very recognizable around the tag so we can inspect it to see if we notice anything strange? Try something like:
112233{ JFBCLike }332211
That should stand out pretty well and then we can see if something's going between the 112233332211 or not.
Thanks!