PS3 CFW CECHA running PS2 DVD9 game backup disc problem

For some reason, I copied the DVD9 backup disc using the PS2 DVD9 game disc, both discs can be used on PS2, but only the real game disc can be used on the PS3, the backup disc cannot be used
This is so weird
The DVD5 disc is fine, but the DVD9 disc does not work on the PS3
Only real PS2 DVD9 game discs will work properly on the PS3
I bet it has something to do with layer bank, PTP/OTP, etc