Were DQ 1 and 2 even released for SNES? *always thought they were GBC and NES only*

Either way I would say it could have something to do with the version of emulator your using, try and find the latest version which might be able to address some issues your having. If not that it could possibly be an error on the ROM itself, either download it again and try, or try and find a second source with the ROM to download at.