I ran ABGX360 on the image and while it was doing the checking: video portion does not match any know data (could be corrupt) appears in yellow.How do you know their info is better than yours!!On two occasions recently, rip of original games did indicated 'DMI unverified' in ABGX, even after a second rip. A few people confirmed they extracted their original and got the exact same image and the same difference to the DB. I do not want to draw any conclusions (data not good, more than one version of stealth info...) as it would be speculation. Only thing sure, nothing better than your data, from your original.
I to add this problem DON'T Listen to what the app is saying just make two Copy's from the Original compared them your self with "Program Output" to HTML using AGBX360. Booted up on the x360 with no Problems.

DMI was the Problem with
Mercenaries 2 and The Lord of the Rings Conquest burn them off at there rated burn speed Stealth Check with S360X too same problem after making two Copys from the Original it's ABGX360 and S360X.
Non-stealth = plays just about anything you throw at it.
iXtreme v1.6.1 xbins or the v1.6 non-stealth Xboxhacker.org