SD formatting loop

Hi everyone, My PS Vita is having some issues, it keeps asking me to format the SD card. Here’s some context: after a few months, I decided to start using my jailbroken Vita again. Before that, I needed a microSD card, so I removed the one from my Vita, copied all its files to a folder on my PC, and used the card for other purposes. Now I want to use it in my Vita again, so I copied the saved files back from my PC to the SD card. However, now I’m getting this format message. Does anyone know how to fix this? I thought copying the files back exactly would work, so I’m not sure what’s causing the issue. Thanks in advance! (you can also private message me if is too complex)