Shin Megami Tensei: Persona 3 Portable

[nokki]

This is a minor issue, but I am getting strange while lines on the maps. Normally there should be white lines for walls, but the map generates grid lines at every corner.

System Specs:
Windows 7 64-bit
Cpu: i7-4770K
Gpu: GTX 460
Monitor resolution: 2560x1600

I wondered if this couldn't be helped, but the very first youtube video of "persona 3 portable ppsspp" does not have this issue:

youtube: /watch?v=VEaEfF7HmLc&t=3m5s