Hello John. We are sorry to hear that your on/off toggle switch on your TGCL-153P is working in reverse in your mulitlocation application. While not a safety issue we would not recommend to leave the dimmer currently installed upside down as it is out of spec. We would suggest to double check the wiring connections as this issue can correleate to a miswire. We would recommend to swap the travelers that are on the top right and bottom left brass terminal screws. If you have any other questions or need additional assistance please feel free to email
support@lutron.com or call (1-888-588-7661) as our tech support team is available 24/7.