[Issue] moving windows

If I have the Project window on one screen and the MixConsole full-screen on another screen it is not possible to move the Control Room, VST Connections and VST Performance windows from the Project screen to the MixConsole screen, but it is possible to move the Transport Panel, Device Setup,Video, VST Instruments and Time Display windows from one screen to the other.

Why does it work for some but not all windows?

Or is it just me?