Fan not spinning below 25%

My taz4 fan does not spin below 25% when set from the screen. Is there a setting in the firmware I need to adjust when upgrading to the new all metal hot end? Has anyone noticed this when updating. I dont reccall noticing this before the firmware was upgraded for the new hotend. I might have never noticed.

My factory TAZ 5 is just like this. Fan does not start spinning till about 27%. This has been true on all of my printers.

Ok, thanks for replying. I guess I never noticed it before.