It's like people complaining about problems on Open PS2 Loader while trying to play pirated isos from the internet... The isos are hacked/modified/f*cked by piracy groups for no particular reason besides being morons. Some Asian release group like to change the game IDs to that of the japanese release of DOA2 Hardcore. A lot of older CD PS2 games are patched for the old SCPH-10000 swap modchip (PBPX-95201 or PBPX-91202 which are the disc IDs of DVD Utility discs 1.0 and 1.1 respectively), games are converted from CD to DVD or from DVD to CD and have ripped/stripped data from them or are ESR patched.
So yes, best solution is buy the game and make a ISO yourself.
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)