The way it's written on the front cover takes precedence over external sources.
Little Busters! is never written in capital letters, and Original Soundtrack is written in the same style on the back:
http://vgmdb.net/db/covers.php?do=view&cover=21843
Also they don't always write the name in all caps, especially for LB:
http://vgmdb.net/album/43003
http://vgmdb.net/album/20008
http://vgmdb.net/album/29965
It's also not in uppercase on the official site, although that often doesn't match what's written on the releases (see the uppercase T in this case):
http://key.soundslabel.com/discograp...sl0035/ksl0035