It’s in principle a known thing on classic amps, the Alps volume pot that Naim chooses because it sounds best has this imbalance at low volume.
As always, there is variability between individual pots, but if it is in a range you would use and it bothers you, talk to your dealer. My new 252 had poor balance nearly up to 8 and it was quickly fixed.
You can find some older discussions and examples of what is generally considered OK and what is not in these older threads: