After comparing the logs thoroughly, I'm pretty convinced, that the non-CSS versions are fakes from china.
Protection free retails (even without CSS) have been seen occasionally, but here I have to conclude that you should return those discs.
There is also a mastering error in the altered code, small but noticeable. The copies weren't made with AnyDVD.
Apart from that the content seems to be the same.
Since it's been crunched down over 40% certainly with substantial loss of quality, you REALLY should return those discs, they are a rip-off.
return the discs saying that they are " fakes from china " ?