What does Home Z do and why is it moving the belts on Maslow4?

What does “Home Z” do and why is it moving the belts on Maslow4? I would think it should only be moving the Z axis but it starts to unwind 2 of the belts. Pressing it caused the belts to become unwound and since there was no tension on them at the time get jammed.

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What that button is supposed to do is to set the z-axis to a known height similar to how “Retract All” pulls the belts in and then we know that they are length zero. That button is supposed to lower the z-axis all the way down to the limit and then raise it back up to 28mm which we’ve picked as the normal starting position.

I will check to see if it is working right and fix it or disable it if it isn’t.