Default hidden files vanish

so i safestrapped and flashed jellybeans on one of the safestrap slots and everything was great.

i hadnt done anything major to my phone but i had a bunch of hidden files (mostly photos) in two files. one was stuff hidden directly from the gallery (select>move>"file name") and it worked great. no problems. another was a
backup" file with media i just moved into there with es file explorer.

two days ago, all of the sudden, gone. cant see it in the dialog when i try to move media in my gallery. i found the file in es file explorer and its empty. same with my backup file. what the hell?

i havent done anything major to my phone.what would cause this? how do i get them back?!