Z-axis works at 1/16 step but not 1/32 - why?

There are clear advantages of using microstepping. Vibration and noise are on the top.

Usually most people opt out for ultra resolution.
But from my personal experience I don’t go beyond the resolution I need. I usually stay within 1/4 to 1/16 microsteping. That allows me to push speeds up a bit more also without the risk of stalling.

I don’t recall well but there are also the problems of current and voltage getting off phase at higher step rates due to the slower rising of voltage.
I also think that’s why using higher voltages yelds better torque (I may be saying something completely wrong). I know “smartter” drivers do some magic to counter act this…I just don’t remeber what cause I studied that years ago.