[IRCServices] Some problems with bans

[Partizanu]

(this could be a little off-topic)
(running services 4.5.1 on bahamut 1.4.22)

We have a channel on our network that has some problems with bans.
Like, a chanop ban/kick a user but the user is still able to rejoin the
channel.
While I was looking in services.log I saw lots of

[date/time] channel: MODE #the_channel_with_problems -b
*!*some at host.here: ban not found

Anyone had this kind of problems before?

Thanks a lot,
Partizanu