Daveytod, what Darth Simon says is correct. It is also possible that your DVD player is set to auto-start the "main movie" which is the longest titleset on a disc. If that's the case, then the player itself is bypassing the menu and auto-playing the disc with the first audio stream selected. If you've done what Darth Simon suggests, (buring the VIDEO_TS folder onto a blank disc) then check the settings on your player to be sure auto play isn't selected. Different models offer and handle this feature differently.

Hope this helps!