Like the title states When I run the code below the depth of the tool changes. Does anyone know why and how do I stop it? This code is generated by fusion 360.

So before the code starts the top of my material is at 19mm. After it executes the code below it thinks the top of my material is 17mm lower.

M1
T2
M6
S12000 M3
G54
M8
G0 X595. Y77.
Z25.01
G81 X595. Y77. Z0. R24.01 F437.