Yes, that's because that character, the pipe, is the delimite of command in mIRC, when used with timer, the command associated to the timer will be of the form 'msg #chan ... | rest of the message', and rest of the message in your case start with "Twist", which is executed as a command (since it's not found, it's sent to the server which reply it doesn't know that command either), the link above explain it all