Apparently there was a nasty bug with LiveFyre, where comments left by guest posters would never get posted back to your database. Since switching back to Wordpress comments, I've noticed some of these missing. The support team has let me know that the bug has been fixed, but unfortunately I haven't been able to resync comments. They have been great guys overall, but I'm afraid some of these comments might be lost.
Just wanted to let you guys know that I didn't delete them or anything, and sorry about that :(