This usually means the ISO file is corrupted or your emulator settings need tweaking. Try switching the backend rendering engine in PPSSPP from OpenGL to Vulkan (or vice versa).
Set to 2x PSP for a crisp look on 1080p screens. Drop to 1x PSP on lower-end devices. wwe 2k14 raw psp iso link
Your console must be running Custom Firmware (CFW) such as PRO-C or LME. Step-by-Step Installation Guide Option A: Playing on Android or PC via PPSSPP Emulator This usually means the ISO file is corrupted
Vulkan (or OpenGL if Vulkan causes visual glitches). overhauling the graphics
as a base, overhauling the graphics, rosters, and arenas to mimic the 2K14 experience on handheld hardware. Key Features of the WWE 2K14 PSP Mod Modders like