Glass looking burnt

I have the xTool d1 and have successfully put several images on glass multiple times but now all the sudden I’m getting black marks like maybe it’s burning it or something? How do I get back to where I need it to be

I watch YouTube tutorials and did what they said. The images weren’t coming out good so I slowed the machine down and they came out perfect. But now at the same settings it isn’t uniform. Parts are black instead of that frosty white

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