Go to the midi preferences, save your current application midi map with a name you can remember, and then create a new one. Now try the column trigger again. Is the eject command gone? Then the problem is your application midi map.
If not, save your composition and create a new one. Load some test content and try the column trigger again. Is the eject command gone? Then the problem is your composition midi map.
Having said all that, Ravensc's Enter program is the best way to control multiple instances of Resolume in a theatre setup. Using a 3rd party OSC solution is a lot more reliable than tinkering your own master/slave setup.