Trouble Engraving

Good morning everyone! I have a problem with the laser when I do engraving. I have a machine with a Ruida controller and 100 watts of Reci power. power is set to 14% and speed to 300mm/s The problem comes with variations in the engraving. sometimes it burns me more than it should, leaving black lines with greater depth and other times it does them well. Has this happened to anyone else? Thank you very much for the help!

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