The "shrunken" identification is done by checking the filesize. How big are the two files?Just tried out v4.430, it looks like Super Monkey Ball 1 and 2 are identified as shrunk when they shouldn't be. I re-ripped the first game from disc using USB Loader GX and it still registered as shrunk in Nintendont.
Not sure if this is something wrong on my end, didn't want to open an issue on Github if that ended up being the case. Keep up the good work Gerbilsoft!