I am dividing my cylinder of 150 mm height into four equal sections, in which I distribute these revolutions: 2-1-1-2. In each section the pitch should be constant. SolidWorks does not give me the same pitch values as my calculations. Are my calculations incorrect?

My calculations:

The pitch should be equal to: Section Height/Number of Revolutions

At the ends: Section Height/2=37.5/2=18.75 mm

In the middle: