Acer 6920g And Hp Hdx-181050ea

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Hi Guys

i have just recently purchased these 2 machines, i still dont understand one thing about this bluray, maybe you guys here can help me.

i recieved a bluray demo disc with the Acer machine which had about 36 minutes of different top title films/movies trailers. when i play it in the acer machine and go to the bluray menu and it shows several titles and which i can play.

then i played it with the HP laptop and went into the bluray menu screen and saw the same tiltes but some extra titles too, but some were missing too.

ie in the Acer laptop and cant see Casino Royal, Spider Man, but can see in The Line of Fire etc.

in the HP i can see Casino Royal, Spider Man etc, but cant see in The Line of Fire

in nut shell some trailers are gained but lost on the Acer, but the trailers that are lost on the Acer are gained in the Hp and the trailers that are gained in the Acer are lost on the Hp.

Why is this? i just use Acer standard software to run the bluray disc on the 6920G, and the hp standard software on the HDX-181050EA