Buttons won't "hold" in specific games

[LunaMoo]

You could try keyboard or touch controls to make sure it's not your hardware, but google for RBU reveals timing issues multiplying input even on real psp(which might have incorrect timing by things like plugins or over/under clocking) PPSSPP also allows over/under clocking, so if you used that - disable it completely, it might not help through since PPSSPP by default does NOT have accurate timings and some badly coded games(mostly japanese) will suffer from weird issues.

Sometimes reducing or increasing the clocks(really not safe;p) or using some compat hacks like draw sync eat cycles(definitely safer, but I'm biased here) can help, but if not, it would need a proper investigation from someone who owns the game and can create some kind of hack, either ppsspp side or just a CWcheat workaround.