Of all albums I've ripped some tracks have a note "differs in x samples @00:00:00-00:00:00", for instance:
1 | (1276/1301) Accurately ripped, or (9/1301) differs in 5000 samples @01:23:31-01:23:05
From CUETools wiki:
Differs in ...
Partial match this track, might be repairable
Does this simply indicate that the rip isn't accurate?