You probably need to change your fingerprinter's strength from "2" to "5" if you haven't done so already. See the last message here on how to do that: hXXs://librarymusicthemes.com/index.php?topic=7771.msg54448#msg54448
Sometimes, it's also an issue with certain genres of music. Particularly
techno, as there is an unknown techno track in MotorWeek episode 1832 that AHA can't ID at all and the fingerprinter false matches with every single PKLZ file, even with vocals removed and the strength set to 5.
Here's the track I'm talking about (starts at 0:23):
