Application appears on all NView desktops

One of out applications does not respect the virtual displays of NView. Regardless of what desktop it is started on it appears in the same position on all desktops. As this is our application we can change the source. Just not sure on what types of things we may be doing to cause this. It is a logging display with performance in mind so might not act quite like a typical windows application. But since the title bar and such also appears on all displays it is not just our display code.