In the build page, if you switch the Queue tab to another (for example, the circle.yml) and then go back again to the Queue tab back and forth multiple times, the messages on the console will start to appear multiple times, as shown here:
In the build page, if you switch the Queue tab to another (for example, the circle.yml) and then go back again to the Queue tab back and forth multiple times, the messages on the console will start to appear multiple times, as shown here: