Laser Tool head Carshing into work board at end of auto focus

I have been trying to get the first run auto focus to work the laser cut a dot not a line on a diagonal across the work boundary with no change other than size of dot alternating big and four small dots. once the cutting is complete the tool moves to the back of the board and crashes into the work surface hard. Which traps the board making it hard to remove the board to examine which cut is better. Any help or advice is welcome
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Hi @Skulldragon33

Looking forward to your reply.
Best regards