Possible Z axis issues?

I have been trying to make these pictures on my Shapeoko 3 XXL, but it never comes out complete.
I have surfaced my spoil board, any tips on what I should do to prevent this?
All comments appreciated, thank you!
![DdD06m6nS6GqrCwiB13KXA|666x500](upload://lj

FgYZvcTiiIqZVZqTAuP9FMjz8.jpeg)

did you surface the stock too before cutting ? It helps a lot (in addition to the wasteboard surfacing)

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