I'm having the exact same problem in the exact same game, I hope we can find a solution.
I found a solution, kind of. Use jpcsp version r2470 from this page http://buildbot.orphis.net/jpcsp/
It gets rid of the multiplied screens. It's still not perfect but it's much better.
I found a solution, kind of. Use jpcsp version r2470 from this page http://buildbot.orphis.net/jpcsp/
It gets rid of the multiplied screens. It's still not perfect but it's much better.