Here is what I have authored for my DVD:

First Play: I have a jpg image set for 3 seconds
I then have 3 video titles A, B, & C
Each video title (except video title C, which has only 1 chapter itself) has 6 chapters.

Video titles' settings:
for video title A: after finishes, play next title
for video title B: after finishes, play next title
for video title C: after finishes, "last menu"

There are 3 Menus:
1st Menu: contains 6 motion buttons from 6 chapters of video title A (I just dragged & dropped each chapter onto the menu). This menu was set with motion menu of 10 seconds with time-out action of 10 seconds.

2st Menu: contains 6 motion buttons from 6 chapters of video title B. This menu was set with motion menu of 7 seconds with time-out action of 7 seconds. (Note: if I set motion menu of this particular menu for 10 seconds with time-out action of 10 seconds, Ulead DVD Workshop would crash at the middle of "rendering motion menu" process...the 2nd Menu works only if it is set at 7 seconds or below for my case).

3rd Menu: contains only one motion button from video title C (again, video title C has only 1 chapter). This menu was set with motion menu of 10 seconds with time-out action of 10 seconds.

Note: I used Ulead DVD Workshop to burn DVD from the image file

The problem is:
Whenever I insert the DVD into my DVD player (or into my computer's DVD drive), the DVD player plays, of course, the First Play and then the first menu...but after 10 seonds of playing the first menu (with the motion button #1 highlighted automatically), it automatically jumps to (and plays) the video title B (I expected that it should play video title A after 10 seconds of playing back motion menu). The same problem also occurs with the 2nd menu (that is, it plays video title C instead of video title B).

What wrong have I done?

Thanks,
DVDFan99