Originally reported here, on a Mali 400 device:
https://forums.ppsspp.org/showthread.php?tid=2301
Seems the graphics have broken at some point.
A frame dump would help, see https://github.com/hrydgard/ppsspp/wiki/How-to-create-a-frame-dump

Look like a similar issue #11573 but different game

Tested on latest Windows build. It looks fine:



Mali-450 GPU
PPSSPP-v1.7.5-438-gccfcbc746
The "disable slower effects" checkbox should possibly be renamed to "increase graphics bugs but also speed".
If it's only broken with slower effects disabled, it's not broken. It's working as well as possible.
-[Unknown]
Although in the post above, it looks like the opposite... Maybe confused ON/OFF?
Oh, my mistake. If this only happens on Mali-4xx, maybe it's a depal issue or else shader blending then? Maybe the shader fails due to shader complexity but then we copy the pixels anyway?
-[Unknown]
Yeah, that seems like a fairly likely explanation..