No word as yet on the status of the file. Its length and content are all over the board in various players and editors, as you noted in another NLE.
All over the board in tests here, as reported above - anywhere from 16 to 54 minutes in length, while MediaInfo reports it to be 22 minutes.
Did you simply load it into VP directly from a DVD? If possible, come up with another method of obtaining the VOB.
Did your mp4 converted VOB load fully into VP? If so, that may be the way to go.
Or play it in a viewer that renders it correctly and use Debut capture software or the like to make a screen recording. Time consuming, but as shown in my demo, the resulting file will have integrity.