Hmm, I didn't see anything wrong with the banfile, other than there doesn't seem to be any extra data (time banned, which admin banned, name of person banned, etc) associated with it that ULX normally puts in. (Usually a case when bans.txt gets deleted and recreated or if you use something other than ulx to manage your bans)
For now we'll have to wait till you can post the server log before I can tell what may be happening