PPSSPP roms corrupted...every time different

[hispanico]

I use PPSSPP on my Firestick and its very strange, when launch emu many popup appear with iso or cso corrupt... i try to compress in cso and also try diffrent same rom.
But i relauch PPSPP and some of there are ok and others show popup of corruption...different different from before..
If i play these roms are play withou problem....I dont understan this

PLS can you help me ?

Thank
Kira