Ok. I did already rip the DVD ISO to my hard drive last week, but I used CloneDVD.
When I reviewed each VOB file, I found that all are correct-each one is a chapter of the DVD and the menu is on as well.

But. When I double click on each of the IFO files, it goes to the same chapter every time.
I can't figure out how the original disc plays, with the IFO files all leading to the same chapter. This explains why my copies all start out at this chapter of the DVD, but doesn't explain how the original disc plays fine...

Should I still try clonecd? Is what I've found with the IFO files normal?