For many amps, the harmonic distortion products descend in level as they increase in order. So you would expect 2 > 3 > 4 > 5 > 6 > 7 > 8 > 9 > 10 > ... Although in a lot of cases 3 and 5 tend to be higher than 2 and 4 respectively, for some reason.At -95db, its going to be way below any background noise you have where ever you listen to music. Bear in mind the cost of this amplifier, and I don't really get "higher than it should be".
Would you be happier if I instead said that H5 was surprisingly low compared to the other orders?