Different Z heights

Maybe someone can help me out.

I have a SM-350 with a 10W laser.

Using Luban my Z height from work piece to bottom of laser tube is 6mm. Burns and cuts good at that height.

Running from Ligtburn, my Z height goes to 26mm. Only burns at higher power settings and not good. Can someone explain the 20mm difference? Have relative Z off for material thickness capability. New to engraving BTH. Appreciate any help.

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