It's WIP hardware, everything works but it's hard to explain due to the number of bios sets / variants.
Slow down a bit , take your time. Especially on rom burning 322's they fail sometimes.
A lot of how it works is hard to explain, but easy to understand, MAME has the games grouped into the bios so you can check there. I think yours has Capcom, tecmo, taito and 8ing so if you try and run atlus for example , you will need to re-burn the bios.
Original games don't run with the mod bios, you need to remove the security chip and put decrypt rom in the rom #5 spot.