Why is laser burning only part of my design

Hello everyone I am completely new with this laser burning. Excited about learning how to use my laser. The design software is very similar to cad progrms that I am familiar with. My problem is that only part of my design is burning. My laser is a yora 6550 and I am burning on a scrap piece of pine 1 x 8.

It might sound like your item is not completely flat on the workbed or your bed is out of level. Can you show a picture of your experiment and of the settings in LightBurn?

Thanks for taking the time to respond to my post. I found the problem. There was a short between my chair and the start button​:joy::rofl::joy:

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