Yes.very True.i had a look.The door height is small , so that it is below you global cut plane.The global cut plane is the one which you can find in your drawing status bar.You can increase the door height, or adjust the global cut plane height so that the door is cut.
Also, to add :
1. You can have a global cut plane in your project.
2. You can have a forced cutplane for the wall, where it will override the global cutplane
3. In the door style display configuration, you have the option to make the door respect the cutplane of the wall or respect the global cutplane.
Hope this helps.
Cheers,
Tharakesh