Everything was fine until I moved .iso's to SD Card

[Lonexmusic]

I need help. I was running out of room in my main storage on my android tablet so I decided to get a 32gb microSD card. As soon as I installed the card, I used my PC with the tablet connected to move all my games over from android memory to the SD card.

From the 6 games, only 3 of them were recognized and the other 3 were replaced by images of white question marks in PPSSPP. When I clicked to open the white question mark images it says, Could not find file, Could not find executable disc, O:\psp_system\sysdir\boot.

I am confused because 3 of the games worked fine. I tried deleting the ones that didn't work and replaced them with a fresh copy from my pc and still, nothing worked.

What's even more stranged, I moved the 3 that didn't work back to the same directory in the android tablet's memory, and 1 of them works now and the other 2 don't.

Any ideas?