I have ringtones saved to my desktop. When I go to put them in my ringtones folder and have then synced one by one, I get the first ringtone fine, I go to put the other one in and it gives me a clone. Something like this:
Ringtone1 syncs fine :R1
Ringtone2 syncs, then menu shows:
R1
R1
NOT:
R1
R2
Create a folder in your "normal" itunes ringtone folder then copy all your ringtones into it and add them into iTunes by the folder instead of by file or drag and drop then into the rigtone section...
See if that works for you..
As to why, iTunes is wierd and does strange things
But....
I would check the XMP and the file info (A.K.A. the tags) and make sure they are the right names in there