This happens with cheat-induced saves (99,999,999 orbs). The game engine cannot render that integer. Use a "safe" save from GameFAQs that maxes out at 99,999 orbs instead.
on a PC to inject the save into a virtual memory card before transferring it to your phone. Troubleshooting Common Save Issues Card Formatting
Your save file must match the region (NTSC-U, PAL, or NTSC-J) of your God of War ISO, or the game will not recognize it.