Fine, I mixed up the info you were trying to do, yet still only managed to give us one more tiny piece of information.
From that piece, you're trying to unban in game console using "ulx unban", and it's not working.
Are you getting an error message? Or does it say user is unbanned?
What message/error do you get when you try to do that?
Look in your game and server console when you try to unban someone. There would likely be an error during the unban.
Additionally, are you using the latest ULib and ULX from our GitHub site (linked from the top of our downloads page).
Since it works from server console, I'd guess you have a conflicting addon affecting your client.