First couple of passes not engaging with material

Hi - when I upload a job, the first couple of passes are often not engaging with the material surface I’d like to cut. I’m trying to just cut out some basic clamps from a sheet of MDF wood.

I’ve designed the pieces using VCarve Pro; I’ve then used a touch probe in the bottom left corner of the material, and then clicked ‘Go to work Zero’; the end mill then becomes flush with the surface/corner of the material I’m cutting. No issues there.

When I then go to run the job, the machine will then begin by outlining the shapes I’m trying to cut - BUT 5mm+ ABOVE the material itself.

The result is that the shapes are then not cut out from the rest of the board.

I’d be grateful for some advice here.

Have I inputted the wrong figures at some point while designing the clamps in VCarve?

Have I not got the router/endmill installed correctly? Is there some other issue with the hardware?

Thank you

Will