I don't know, sorry; I don't do any gaming on Android, so I don't know how to diagnose what issues could cause your problem.
It could be a pathing issue or it could be a modification to the base game's render pipeline that's causing issues when run through the interpreter.
Though if it is an RPGMV game, I'd just run it through a browser directly rather than using NWJC binaries; it's pretty much just a glorified browser, most stuffs done in javascript.
Also, I just realised you were asking for a decompiler, that's me replying to a post when I'm heading off to bed
Sorry, don't know of any, I usually just work with JS or the actual game files, I've never really had to decompile a game's compiled javascript plugins since I can just figure out what it's meant to do and replace it.