Frage Z hight problem

Hello, kinda new in this cnc world. i stopped cnc'ing for some months, now i pick it up again, updated my WINPC-NC to version 4.0. Building my cam in fushion 360 as before.

The problem: when i start .nc file to run in winpc-nc. the spindle moves (Y&X) to the right place to start the milling operation, then the Z axis drops way to much like 20mm (mostly into my wood and backplate). after this weird drop the Z hight the spindle goes to the right 0 hight and will begin making the paths.

Can anybody help me out?

Anthony,
If you use G-code you must invert the Z-axis in WinPC.
Go to >Parameters>Import Formats. and place marker at "Invert Z-coordinates". Check if in "Import Formats" the G-code is checked.

That should work for you.