every time i join a room i keep seeing this in all channels

[00:51] * is now known as pouncer

anyone know why it happens and how to stop it?

Well, that's what one would see when someone changes their nickname. Weird how it triggers when you join a room though.

Do you have an event for On NICK somewhere? If so paste it in here.

Actually, any /nick command (search without the /) could be the culprit. Perhaps you have a script that maintains your nick, but the nick it's maintaining isn't your primary nick, so after you join the network, it changes your nick and it just happens to do it when you're joining a channel. Of course, if it does it everytime you join a channel (even after it's done it once), then it's some other cause. Still, "nick" is a good thing to look for.