Are you
sure you transferred from the same
main user account? It sounds a little like the System assigned account numbers don't match. I think the admin number is 502. The System keeps 500 & 501 for it's own use. Other accounts get numbers from 503 and up. If you transferred from a non-admin account to your admin account, those numbers won't match, even if the names do. I'm just thinking...
If you have a very large number of folders to change, it might be a lot easier to start over with a clean/erased and correctly formatted drive. Assuming your "new Mac" is an intel model, be sure it is formatted as GUID, BTW.
I only have 30 or so folders left, it's to the point now I'm finding the rest have the correct admin, I wonder if a few files might have gotten corrupted when my G4 went belly up, I was in the process of loading 10.5 when it died? My G4 was the first Mac to die