Ah very interesting, thanks for that. OK so that suggests that it’s not treating it as a NukeStudio launch, and is probably instead treating it as a standard Nuke launch.
I just took a look at your site, and I can see that you’ve defined a Nuke Studio Software entity, with a path, and set the args to -studio. But I think the arg needs to be --studio. I’m hoping that is the issue. 
Edit, to include more information in the answer: @Ross_Macaluso also found that the engine value was set incorrectly: Can't get shotgun toolkit to work with nuke studio, config_default2