Again, it seems to be an issue with Facebook itself. Can you let us know:
* What browser you're using
* What OS (Mac/Windows) you're using
* What country you are in (if you are ok sharing that)
Something does seem weird, but I don't think it has anything to do with JFBConnect. Facebook is constantly changing things, and if one 'weird' CSS file gets pushed out by them, it can cause problems for weeks as browsers will cache it and their servers (spread around the world) don't always get updated immediately.
We'll gladly continue to investigate, but again, not sure we can do anything about it.
Thanks,
Alex