Hi, I respond your questions:
❌ Have you tried the actual SF2:SCE Cartridge? I don´t have the cartridge
✔ Have you tried playing the ROM on an emulator like RetroArch (GENS core) to see if the problem exists? I played in GENS and works fine
❌ Have you tried putting the ROM on a different SD card to see if the problem is fixed? I must try it
❌ Have you tried another ROM image? I must try it
✔ Have you verified if you're using a NTSC or PAL ROM? If so, is your Genesis/MegaDrive made for the same region as the ROM? It is PAL Version
❌ Have you tried using another Genesis/MegaDrive console with the Mega Everdrive? No, not yet
My Mega Drive is a Model 1 VA3 motherboard.