When running Fatal Fury 2 on the Neo Geo, if you LOAD any saved states it causes the game to put the clock always on "00" into the next round (if you load before Round 2 stars) making you losing your credit after that or the attacks don't hit the enemy (if you load before Round 1 starts), making only the grapping moves available.
Already tested several different ROMs and this bug happened with all of them, including different BIOS from different regions. That doesn't happen with Fatal Fury Special, only with Fatal Fury 2.