Reminds me of the early days of Honda automobiles. The idea of quality at Honda was so drilled into employees one of them recounted how if he saw misaligned wipers on Hondas parked on the street he would straighten them out. He could not stand the idea of such a sloppy thing on cars he helped assemble. They were to be assembled as perfectly as possible.
With fluted metric shafts, there are IIRC, 18 flutes (16 actual and two missing for the split shaft), which means 20 degrees per position on the knob. The pictured error looks less than 20 degrees to me. If the knobs they are buying have an insert and a screen/marked cap- they should have a locator moulding or pin inside to prevent poor alignment.
If the shaft is a 'D' shape, the knobs are to blame as the selector is PCB pin mounted and would align perfectly (it should).
If the shafts are round (unlikely), then it's somebody's job to secure the knob's grub screw correctly and they clearly need retraining...
I've been known to completely dismantle receivers to de-solder and re-align pots to chassis mountings just to get the knobs perfectly aligned to the degree. Most boards were assembled, pots and all and then placed into the front panel chassis. With pots like balance and stepped tone etc, it's better to install the pots in the chassis perfectly, so the knobs are all precisely centred and then solder the PCB afterwards (if you can). Makes a huge difference to aesthetics. Vintage Marantz (SRC Japan) was really average when it came to matching knobs to flute alignment. They were pretty much the worst with the aluminium caps rarely aligning perfectly. Sometimes considerable time is spent by me looking for the best combination, especially with detented pots.