This has been a known issue for many, many months. There is an old thread about it in the Other Support forum with a slew of users, including myself, begging Livestream to do something about it. So far they have not addressed the issue other than to say they are "looking into it".
Livestream. You need to get this taken care of. Bots pretending to be mods is a serious security issue, not to mention extremely annoying for my viewers. If this isn't addressed soon I will be moving my channel to Ustream, Justin or Twitch.