Hacking PSP Not Reading All Isos on Memory Stick

[videogamer6168]

Okay so I understand the process of where to store and places ISOS in the system roots and everything. My problem is I currently have 14 games loaded that run and load properly when I open the memory stick under game but the 6 or 7 new Isos I put in the roots with the other games that already function are not showing up and I dont understand why my psp is not showing they are there. Any help would really be appreciated.