yep, they're bootlegs, and have the same flaky production values as any other bootlegs even if the base board is original Capcom.
none of the qsound based games use qsound either, they all use music and effects ripped from other games (because the converted boards don't have the qsound chips) I'm told a number of the games have tile glitches like some early versions of MAME too, because they've not all been modified correctly to work with the addressing pals.
they're not MAME, so it's none of our business what you do with them, but if you're buying one thinking it's high quality / official / legal to use you're mistaken.
They were interesting at one point because they include the 'Street Smart' bootleg of Final Fight (not the SNK game) which allows you to play as the enemies / bosses, but even that's been dumped now, and runs in MAME
"ffightjh Street Smart / Final Fight (Japan, hack)"