Set up event handlers that chained the running of automation scripts. Script 1 was launched from the UI. An event handler was set up to launch script 2 when script 1 was complete. Another event handler was set up to launch script 3 when script 2 was complete.
Under the latest 1.7.5 develop branch, each completion resulted in two launches of the subsequent script.
See screenshots for setup and outcome. Charlie was able to reproduce this on a CentOS DEV machine running 1.7.0_191 but not on his local machine running Java 8.