Laser cut correctly in the bottom left, top right, but not in the center

I calibrated the light burn steps focusing on the edges, I made a video to illustrate, in the lower right part it cuts perfectly as the recorded image shows, and in the upper right end of the sheet too, but when I make the cut in the middle it distorts, as shown in the video, if anyone has any idea what it could be and can shed some light on it I would appreciate it.

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